Physics Unit23: Light and Geometric Optics - 51fly国际课程 (51fly.win)

1#

Reflection, refraction, and t +d.(:c kga e3cpweq r .zon)co8:fu,whe formation of images by mirrors and lenses has been sue.d u: (:ck)a 3zfww+egc o.rc8oq,n pccessful described by the

A. wave model of light.

B. ray model of light.

C. particle model of light.

D. none of the given answers

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The angle of incidenceghfd gv2 -d.kiz(px. tc33 6wwueg:e+

A. must equal the angle of reflection.

B. is always less than the angle of reflection.

C. is always greater than the angle of reflection.

D. may be greater than, less than, or equal to the angle of reflection.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which mirrors wowy1t.e+ir/r p rk is

A. refraction.

B. polarization.

C. dispersion.

D. reflection.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plane mirror forms an i 5l9fsfnwt e63mage that is

A. real and upright.

B. virtual and upright.

C. real and upside down.

D. virtual and upside down.

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Plane mirrors produce im)*a xmsj3 y,jrages which

A. are always smaller than the actual object.

B. are always larger than the actual object.

C. are always the same size as the actual object.

D. could be smaller, larger, or the same size as the actual object, depending on the placement of the object.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image formed when the light rays do notg hi7sd/ d4lde7sjddaw ,jx6aqh+) ./ actually pass through the image location, and woug/+dd h64j7 q.e7,a wids hjlas/d)dxld not appear on paper or film placed at that location is referred to as

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image formed when the light rays pass througfs f8mt2g zr5 t( msjgr60g3k8h the image location, and could appear on paper or film placed at the that location is referred to s mfr3g(tj gfk828sr ztg06 5mas

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is it possible to see a virtu1pvmudtimq( )ib33a 2al image?

A. No, since the rays that seem to emanate from a virtual image do not in fact emanate from the image.

B. No, since virtual images do not really exist.

C. Yes, the rays that appear to emanate from a virtual image can be focused on the retina just like those from an illuminated object.

D. Yes, since almost everything we see is virtual because most things do not themselves give off light, but only reflect light coming from some other source.

E. Yes, but only indirectly in the sense that if the virtual image is formed on a sheet of photographic film, one could later look at the picture formed.

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical mirror on which reflection takes place on the outer surface ofdl tl4;iqi.v rh.o7k ) the spherical s .;r.)v lkqt4iil7 dohhape is referred to as a

A. convex mirror.

B. concave mirror.

C. plane mirror.

D. double-sided mirror.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical mirror on which reflection takes pla9vm z1sx4mp. vce on the inner surface of the sphere is referrez4m9 .sxvm1pv d to as a

A. convex mirror.

B. concave mirror.

C. plane mirror.

D. double-sided mirror.

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the radius of curva*ve lwg d::d1asma4v+wp7 p9j ture of the concave mirror is r, the focal length is

A. 2r

B. r

C. r/2

D. cannot be determined from the information given

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling parallel to a concave mirror'suga-+wqdeb*. hcid t4r b+u(: axis, strikes the mirror's surface nearwb+ ch-(:+u* qrud 4agbid .et its midpoint. After reflection, this ray

A. again travels parallel to the mirror's axis.

B. travels at right angles to the mirror's axis.

C. passes through the mirror's center of curvature.

D. passes through the mirror's focal point.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mirror)emf /eb qv. mkx8d61e/ wtel- on a path parallel to the axis is reflected

A. back parallel to the axis.

B. back on itself.

C. through the focal point.

D. through the center of curvature.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling obliquely to a concave mirror's axis, crosses j m6vm jkp 2*k*/ 6l*l-figlujthe axis at the mirror's center of curvature befoj2l* lij 6m*jlgmkuv/p-f k 6*re striking the mirror's surface. After reflection, this ray

A. travels parallel to the mirror's axis.

B. travels at right angles to the mirror's axis.

C. passes through the mirror's center of curvature.

D. passes through the mirror's focal point.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mirror owqh3t07 jh hq1o.tf3e n a path through the center of curvature is reflected. j1 htq7ow3q30eh thf

A. back parallel to the axis.

B. back on itself.

C. through the focal point.

D. midway between the focal point and the center of curvature.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling obliquely n ;hiu4zdk+ p/9kezel ii ,8/n m(ngo2to a concave mirror's surface, crosses the axis at the mirror's focal point 9/lpun,8gmi od4kk ;2h(nzneii/+ ze before striking the mirror's surface. After reflection, this ray

A. travels parallel to the mirror's axis.

B. travels at right angles to the mirror's axis.

C. passes through the mirror's center of curvature.

D. passes through the mirror's focal point.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mirror opzr;vr9;kts3than pn 9fgm 8; 0rh8q7n a path through the focal point is reflecte;kr v8 qths09fr7mgr3n n 9hptz;8;ap d

A. back parallel to the axis.

B. back on itself.

C. through the focal point.

D. through the center of curvature.

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18#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State how to draw the three rays for findl4nogcxp 3-71a9tlj ping the image position due to a curved 37 jt l4nog1xla9ppc- mirror.

该题自我估分: (必填) (满分:1.0分)

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a concave mirror, exactly at its foc494ucka x,i wbal point,

A. you won't see your image because there is none.

B. you won't see your image because it's focused at a different distance.

C. you will see your image, and you will appear smaller.

D. you will see your image and you will appear larger.

E. you will see your image at your same height.

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a concave mirror's center of curvature. hw 53a ,bot+wbThe image produced by the35 b,h+oa bwtw mirror is located

A. out beyond the center of curvature.

B. at the center of curvature.

C. between the center of curvature and the focal point.

D. at the focal point.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is positioned between a concave m6qkjh0l5k ez91 ii6f(xj-jj+dc6 lns irror's center of curvature and its focal point. The image produced by the mirro50s6 9kkqjzjixh- e1nj(df6+ ji 6llc r is located

A. out past the center of curvature.

B. at the center of curvature.

C. between the center of curvature and the focal point.

D. at the focal point.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is situated between a concave mirror's su npok5b)48 hxbo )g;iwrface and its focal point. The image form; w)p5kog bh8 xb)no4ied in this case is

A. real and inverted.

B. real and erect.

C. virtual and erect.

D. virtual and inverted.

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a convex mirror, at the same distance from it as i 9yadta20 hb *v8qy4 z-ikk*hits radius of *9i- yhkbtv2q aha4y8ki 0dz* curvature,

A. you won't see your image because there is none.

B. you won't see your image because it's focused at a different distance.

C. you will see your image and you will appear smaller.

D. you will see your image and you will appear larger.

E. you will see your image at your same height.

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a convex mirror, at the same do ;t:ti ra+is.ts l3st 5g4hg1istance from it as its focal lenlri .1ts5 : i+t gahss;gt4ot3gth,

A. you won't see your image because there is none.

B. you won't see your image because it's focused at a different distance.

C. you will see your image and you will appear smaller.

D. you will see your image and you will appear larger.

E. you will see your image at your same height.

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Sometimes when you l qw1:nlsu +:z 3sirq+1wt h7eb(pzt b;ook into a curved mirror you see a magnified image (a great big you) and sometimes you see a diminished image (a little you). If you look at the bot:qt pq 1(lbbzuh++wz:n13ts s7rewi ;tom (convex) side of a shiny spoon, what will you see?

A. You won't see an image of yourself because no image will be formed.

B. You will see a little you, upside down.

C. You will see a little you, right side up.

D. You will see a little you, but whether you are right side up or upside down depends on how near you are to the spoon.

E. You will either see a little you or a great big you, depending on how near you are to the spoon.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Concave spherical mirron/j2 j7f;kgsj dgeig26bseh* /m 4;y 2 tukn6ors produce images which

A. are always smaller than the actual object.

B. are always larger than the actual object.

C. are always the same size as the actual object.

D. could be smaller than, larger than, or the same size as the actual object, depending on the placement of the object.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Convex spherical mirrors produce images w 0 ;m6ey)3igff.6emntzqvd6 vhich

A. are always smaller than the actual object.

B. are always larger than the actual object.

C. are always the same size as the actual object.

D. could be larger than, smaller than, or the same size as the actual object, depending on the placement of the object.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single concave spherical mirror6jp5x1ic+fw1q rz; ,mvruy*o produces an image which is

A. always virtual.

B. always real.

C. real only if the object distance is less than $f$.

D. real only if the object distance is greater than $f$.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single convex sphericalw2yd q5f0 bc 31wfornl((js4t mirror produces an image which is

A. always virtual.

B. always real.

C. real only if the object distance is less than $f$.

D. real only if the object distance is greater than $f$.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A negative magnification for a mirror meanmva w3ap:gwu d ,+a,d-s

A. the image is inverted, and the mirror is concave.

B. the image is inverted, and the mirror is convex.

C. the image is inverted, and the mirror may be concave or convex.

D. the image is upright, and the mirror is convex.

E. the image is upright, and the mirror may be concave or convex.

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the image distance is positive, the image formed ho q 6*wqt1 -hcm2f*.bsx mu+ris

A. a real image.

B. a virtual image.

C. either a real or virtual image.

D. can not be determined.

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the image distance is negative, the im) 3af-id /;i2cbly vnnsw0q(u age formed is

A. real image.

B. virtual image.

C. either a real or virtual image.

D. can not be determined.

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the magnification is a positas5u04qcyq w1-):w*ed s*ci x)gjoc kive value, the image is

A. upright.

B. inverted.

C. enlarged.

D. shrunk.

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the magnification is a negative value, the im4vq; sfs yq;w6(19 :ikcm jdtwkd2 1ugage is

A. upright.

B. inverted.

C. enlarged.

D. shrunk.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the absolute value of the magnificati20h iipqtq 3,bon is larger than one, then the image isbiq2hi3,0pqt

A. larger than the object.

B. the same size as the object.

C. smaller than the object.

D. can not be determined.

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the absolute value of txj wp)89g tvq5:jxup(nya 6xw,-mwr( he magnification is smaller than one, then the image ix( ( xq:uy-p9 pt )gavxn,5jwww6jrm8 s

A. larger than the object.

B. the same size as the object.

C. smaller than the object.

D. can not be determined.

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the absolute value of the magnification is equal to one, then the image b; up-2w hgqq*is

A. larger than the object.

B. the same size as the object.

C. smaller than the object.

D. can not be determined.

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light travels fastesb+lu42z4- p16d-6 lchx +edbjvug oa zt

A. in a vacuum.

B. through water.

C. through glass.

D. through diamond.

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

For all transparent material substances, the index of refra5drw 08t3 b;vg zfq,hbeehg6) ction

A. is less than 1.

B. is greater than 1.

C. is equal to 1.

D. could be any of the given answers as it all depends on optical density.

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An index of refraction y-h 3ls7t qd1+6dm1vz 4hz0 6auv shajless than one for a medium would imply

A. that the speed of light in the medium is the same as the speed of light in vacuum.

B. that the speed of light in the medium is greater than the speed of light in vacuum.

C. refraction is not possible.

D. reflection is not possible.

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The index of refraction of diamondf zx,jm)v 60ar is $2.42$. This means that a given frequency of light travels

A. 2.42 times faster in air than it does in diamond.

B. 2.42 times faster in diamond than it does in air.

C. 2.42 times faster in vacuum than it does in diamond.

D. 2.42 times faster in diamond than it does in vacuum.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The angle of inciden9z3(ndicy p(zce

A. must equal the angle of refraction.

B. is always less than the angle of refraction.

C. is always greater than the angle of refraction.

D. may be greater than, less than, or equal to the angle of refraction.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light traveling at an anglr(uv 0: k)jdae*1sr:dt zdvjk86n w7ie into a denser medium is refracted

A. toward the normal.

B. away from the normal.

C. parallel to the normal.

D. equally.

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters air from water. The angle of refractio 23y sn3edsmxfnu7f)7n will be

A. greater than the angle of incidence.

B. equal to the angle of incidence.

C. less than the angle of incidence.

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ray of light, which is t1oza -nin lyo 0(g2gvf;h, ig)raveling in air, is incident on a glass plate at a $45^{\circ}$ angle. The angle of refraction in the glass

A. is less than $45^{\circ}$.

B. is greater than $45^{\circ}$.

C. is equal to $45^{\circ}$.

D. could be any of the above; it all depends on the index of refraction of glass.

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which fiber optics is:spoz ua4if7 ;y:;ist based is

A. refraction.

B. polarization.

C. dispersion.

D. total internal reflection.

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The critical angle for a beam of light passing from water inb+sret*nhx.0 to air is $48.8^{\circ}$. This means that all light rays with an angle of incidence greater than this angle will be

A. absorbed.

B. totally reflected.

C. partially reflected and partially transmitted.

D. totally transmitted.

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which lensespc +so8 ;0w)tkvlau ,byy xo:+ work is

A. refraction.

B. polarization.

C. dispersion.

D. total internal reflection.

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thickest at tv 5z eahr3gly5-z aq*o4c. bl-he center called

A. converging lenses.

B. diverging lenses.

C. either converging or diverging lens.

D. can not be determined.

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thinner at the center than the edges are cal / sva5x4lijp*led

A. converging lenses.

B. diverging lenses.

C. either converging or diverging lens.

D. can not be determined.

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thicker a(hq2,u o+bjy*g/o vh lt the center

A. spread out light rays.

B. bend light rays to a point beyond the lens.

C. have no effect on light rays.

D. reflect light rays back.

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two diverging lenses are similar except that lens B is rated at 20 diop0/0ch0xrxf) iz 5v9w.vtmdclters, whereas lens A is rated at 10 diopters. The 50z0hi/ rltcvwx9mcdxv0 )f .focal length of lens B is

A. one-fourth of the focal length of lens A.

B. one-half of the focal length of lens A.

C. twice the focal length of lens A.

D. four times the focal length of lens A.

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling parallel to the axis of a thin concave lens, s;v3 x qrhsz sd963t3blpp s:(ntrikes the lens near its midpoint. After travelid x36;9(3snvp rt3shslq:z pbng though the lens, this ray emerges traveling obliquely to the axis of the lens

A. such that it never crosses the axis.

B. crossing the axis at a point equal to twice the focal length.

C. passing between the lens and its focal point.

D. passing through the focal point.

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling parallel to the axis of a convex thin lens, strikes thtfi1x0t 9yz 4fe lens near its midpoint. After travelz i09f14xttyf ing through the lens, this ray emerges traveling obliquely to the axis of the lens

A. such that it never crosses the axis.

B. crossing the axis at a point equal to twice the focal length.

C. passing between the lens and its focal point.

D. passing through its focal point.

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55#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State how to draw the tuxyh 1f dvl+h, ,eq3r8hree rays for finding the image position due to a thin lens +38u,vf yxeqhh1 ld,r.

该题自我估分: (必填) (满分:1.0分)

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has focal len c-vri :l;boj2+s f.dbai,bn1gth $f$. An object is located at infinity. The image formed is located

A. at $2f$.

B. between $f$ and $2f$.

C. at $f$.

D. between the lens and $f$.

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a focal le(tz/aql*4 pddo1 + ijength $f$. An object is placed at $f$ on the axis. The image formed is located

A. at infinity.

B. between $2f$ and infinity.

C. at $2f$.

D. between $f$ and $2f$.

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a focal lenrz qua,28 xz/;cu*db xb81j jdgth $f$. An object is placed at $f$ on the axis. The image formed is located

A. at $2f$.

B. between $f$ and $2f$.

C. at $f$.

D. between the lens and $f$.

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a focal lengt h am mz56wv9 +f6yemwqz8p;/dz)jh9 vh $f$. An object is placed between $f$ and $2f$ on the axis. The image formed is located

A. at $2f$.

B. between $f$ and $2f$.

C. at $f$.

D. at a distance greater than $2f$ from the lens.

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a foc3o y5spw9egso ;h+d0 bal length $f$. An object is placed between infinity and $2f$ from the lens on its axis. The image formed is located

A. at $2f$.

B. between $f$ and $2f$.

C. at $f$.

D. between the lens and $f$.

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A object is placed between a convex len:v h:vh3x 7/ gbblce8ms and its focal point. The image formed ishecbvh/lm: b 87xgv3 :

A. virtual and erect.

B. virtual and inverted.

C. real and erect.

D. real and inverted.

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The images formed by concave lenq3a3s)v/ioj, 5bfb- ofhui9 bses

A. are always real.

B. are always virtual.

C. could be real or virtual; it depends on whether the object distance is smaller or greater than the focal length.

D. could be real or virtual, but always real when the object is placed at the focal point.

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The image of the rare mkl5 a:anj q 36c89lj:tftxc/ stamp you see through a magnifying glass is

A. always the same orientation as the stamp.

B. always upside-down compared to the stamp.

C. either the same orientation or upside-down, depending on how close the stamp is to the glass.

D. either the same orientation or upside-down, depending on the thickness of the glass used.

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lamp is placed 1 m from a screen. Between the lamp and the screen x*h) 2ji7fjcu is placed a converginjjcxf* 2u7h )ig lens of focal length 24 cm. The filament of the lamp can be imaged on the screen. As the lens position is varied with respect to the lamp,

A. no sharp image will be seen for any lens position.

B. a sharp image will be seen when the lens is halfway between the lamp and the screen.

C. a sharp image will be seen when the lens is 40 cm from the lamp.

D. a sharp image will be seen when the lens is 60 cm from the lamp.

E. a sharp image will be seen when the lens is either 40 cm from the lamp or 60 cm from the lamp, but not otherwise.

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two thin lenses, of focal le4)j;h))x8gwbb 8 fg5bccsoxqngths $f_1$ and $f_2$ placed in contact with each other are equivalent to a single lens of focal length of

A. $f_1 + f_2$.

B. $1/(f_1 + f_2)$.

C. $(f_1 + f_2)/f_1 f_2$.

D. $f_1 f_2/(f_1 + f_2)$.

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two thin double-convex (convex-convex) lenses are placed in conta-f9 of57yox*mcog6;o woaz u 3ct. If each has a focal length of 2z5 3-*o7faxgo mcw of9;o6uy o0 cm, how would you expect the combination to function?

A. about like a single lens of focal length 20 cm

B. about like a single lens of focal length 40 cm

C. about like a single lens of focal length slightly greater than 20 cm

D. about like a single lens of focal length less than 20 cm

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diverging lens ($f = -4.0 \; cm$) is positioned 2.0 cm to the left of a converging lens ($f = +6.0 \; cm$). A 1.0-mm diameter beam of parallel light rays is incident on the diverging lens from the left. After leaving the converging lens, the outgoing rays

A. converge.

B. diverge.

C. form a parallel beam of diameter D > 1.0 mm.

D. form a parallel beam of diameter D < 1.0 mm.

E. will travel back toward the light source.

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A laser beam strikes a plane's reflecting surface with an ang0r ocbz1g4o vmi gh98b3)0f yig,ed6 mle of incidence of di,vg bo68fbo)cymg r1h g4 i0930 ezm$52^{\circ}$. What is the angle between the incident ray and the reflected ray?

A. $52^{\circ}$

B. $105^{\circ}$

C. $45^{\circ}$

D. $90^{\circ}$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is located 2.6 m in front of a plane mirror. The image formed by txjav2;4j)24p;t vtm/lqq m sd he mirror app4qq)l;tj sv2/;m pa42t vx mdjears to be

A. 1.3 m in front of the mirror.

B. on the mirror's surface.

C. 1.3 m behind the mirror's surface.

D. 2.6 m behind the mirror's surface.

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far are you from your image when you stand 0.75 m in f4 *jz(r,7l c6i7in1 thdf owzxront of a vertical plane mirrori w(n7i,lz rc6dfxz* 7h1j4to ?

A. $0.75 \; m$

B. $1.5 \; m$

C. $3.0 \; m$

D. none of the given answers

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How fast do you approach, hdsf1 eqas6juk/a 4+ your image when you approach a vertical plane mirror at a speed of 2 mufs/1d+ aa qs 64he,jk/s?

A. 1 m/s

B. 2 m/s

C. 4 m/s

D. none of the given answers

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical concave mirror has a radius of curvature of 20 cn)z f0/5lkx)hxc9 e; /kzhca cm. How far from the mirroe/z) hlz)0x cahk9cxc/n;5f kr is the focal point located?

A. $10 \; cm$

B. $20 \; cm$

C. $30 \; cm$

D. $40 \; cm$

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave mirror with a rmh0z/+js;rv+/fyd*n ljy / msadius of 20 cm creates a real image 30 cm from the mirror. What is the object distanry//yj+ 0j ms/hd* flzvm;+ns ce?

A. $20 \; cm$

B. $15 \; cm$

C. $7.5 \; cm$

D. $5.0 \; cm$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A object is 12 cm in front of a concave mirror, and thxs5nlh7 d 1. mkynbjj3)3zz;ze image is 3.0 cm in frontd xn5kh3sb m;j7y)j3z.lz z1 n of the mirror. What is the focal length of the mirror?

A. $15 \; cm$

B. $4.0 \; cm$

C. $2.4 \; cm$

D. $1.3 \; cm$

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 10 cm in front of a concave mirror with focal length 3 cm. Where i*8n.u jp cbak(s (cp. nuabk *8jthe image?

A. 13 cm from the mirror

B. 7.0 cm from the mirror

C. 4.3 cm from the mirror

D. 3.3 cm from the mirror

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave spherical mirror has a focal length-*9mhfcyzvn3 of 20 cm. An object is placed 10 cm in front of the mirror on the mirror's axis. Where is t-3nzmv*hy 9fc he image located?

A. 20 cm behind the mirror

B. 20 cm in front of the mirror

C. 6.7 cm behind the mirror

D. 6.7 cm in front of the mirror

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave spherical mirror has a focal length of 20 cm. An object ismjp+ 1jxj-sd. placed 30 cm in front of the mirror on the mirror's axis. Where is the image locatej .1- +sjdpmjxd?

A. 12 cm behind the mirror

B. 12 cm in front of the mirror

C. 60 cm behind the mirror

D. 60 cm in front of the mirror

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78#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 5.7 cm from a concave mirror. The image is 4.7bq t *dfac7.,it9 hsk) cm tall, and 10 cm from the mirror. How tall is the objectt,hafbs)7 qdi*.9 k ct?

A. $12 \; cm$

B. $11 \; cm$

C. $8.2 \; cm$

D. $2.7 \; cm$

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 15 cm from a concave mirror o( njm8 ogu,x7fzlt+s1f5:pdn f focal length 20 cm. The object is 4.0 cm tall. How tall is the +n(x 5l 7j:1t8so fnmg,uz fpdimage?

A. $1.0 \; cm$

B. $2.0 \; cm$

C. $8.0 \; cm$

D. $16 \; cm$

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80#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 47.5 cm talmz;g8ip y3 zsbej.r(2:.lq2:mlzudmi/ r ;e x l. The image is 38.6 cm tall, and 14.8 cm from the mirror. How far is the object from the2/uiszp 2; y 8 zjxb e: mm.q;r(ml.r3i:glzde mirror?

A. $124 \; cm$

B. $47.6 \; cm$

C. $18.2 \; cm$

D. $12.0 \; cm$

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.4 cm tall object is 4.0 cm from a concave mirror. If the image is 4.0 cm-1z1 dll2u/ f/ -pv uhyitclsex:k ,q2 tall, how far is it from the mirror h,su1v/i:1 uc2f/x tlplk-l-dyq2 ze?

A. $11 \; cm$

B. $9.4 \; cm$

C. $1.4 \; cm$

D. $0.090 \; cm$

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 15 cm from a concave mirruq*yixw o0xn+6 qh oe( j8ts37or of focal length 20 cm. The object is 4.0 cm tall. Where is the image locateds3un (eoi*qq67yj0 x8xwhot +?

A. 12 cm behind the mirror

B. 12 cm in front of the mirror

C. 60 cm behind the mirror

D. 60 cm in front of the mirror

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a person stands 40 cm in frontzghinkivs5+) e d .k-/ of a cosmetic mirror (concave mirror), the erect image is twice the size of the object. What is the focal lki eszh ni)kvg+ 5-/.dength of the mirror?

A. $27 \; cm$

B. $40 \; cm$

C. $80 \; cm$

D. $160 \; cm$

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A person's face is 30 cm in front of a concave shaving mir1 3g)vtz d;jo:ds kv0xror. If the image is an erect image 1.5 times as large as the objectk0zx g)v;d:v jst do13, what is the mirror's focal length?

A. $20 \; cm$

B. $50 \; cm$

C. $70 \; cm$

D. $90 \; cm$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image is 4.0 cm behind a concave mirror with focal length 5.0 cm. Whe( 9lsafq44 yaeg-m9p4r-uynh re is the object?y4fa(q94hmur py sa9nelg-4 -

A. 2.2 cm in front of the mirror

B. 2.2 cm behind the mirror

C. 9.0 cm in front of the mirror

D. 1.0 cm behind the mirror

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex spherical mirror has a focal length of -20 cm. An object ij u)ajlrs7 g) h.)30xvnya9r qs placed 10 cm in front of the mirror on the mirror's axis. Where is the image l l u)yj3)xg.ran 70 )vh9rajsqocated?

A. 20 cm behind the mirror

B. 20 cm in front of the mirror

C. 6.7 cm behind the mirror

D. 6.7 cm in front of the mirror

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex spherical mirror has a focal length of -20 cm. An gt+2::qry3yf ky;;a qm evq5 xobject is placed 30 cm in front of the mirror on the mirror's axis. Where is the imagq+:qge;y:qtm2yyx 5;frak v3e located?

A. 12 cm in front of the mirror

B. 60 cm behind the mirror

C. 60 cm in front of the mirror

D. none of the given answers

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 14 cm in front of a a el(dv+bm9.pconvex mirror. The image is 5.8 cm behind the m.mpe 9vb +la(dirror. What is the focal length of the mirror?

A. -4.1 cm

B. -8.2 cm

C. -9.9 cm

D. -20 cm

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 8.90 cm tall. The image is 7.80 cm tall, axp7l1fi v 9p15*z 10nbgwv hlond 14.8 cm from a convex mirror. What is the mirror's focal length?7xwgnbl fiz v 1phov150* l91p

A. -120 cm

B. -105 cm

C. -16.9 cm

D. -13.0 cm

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If a material has an index of refraction of 1.50, what is the speedndtm5-yqsmf qyav-7v7 5c8( m of light through7qvftn yma7q v -8dym-(5ms5c it?

A. $2.00 \times 10^{8} \; m/s$

B. $3.00 \times 10^{8} \; m/s$

C. $4.50 \times 10^{8} \; m/s$

D. $6.00 \times 10^{8} \; m/s$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray in air is incident on an air to glass in/ lybg7 nad:m m7/cu33n(vjavterface at an angle of $45^{\circ}$ and is refracted at an angle of $30^{\circ}$ to the normal. What is the index of refraction of the glass?

A. 1.23

B. 1.31

C. 1.41

D. 1.74

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters a substance from air ab vti :cb2b) f5d/ljj,t an angle of $32.0^{\circ}$, and continues at an angle of $23.0^{\circ}$. What is the index of refraction of the substance?

A. 0.74

B. 1.11

C. 1.28

D. 1.36

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light passes from air to water. The incomingu1hw (dwt, v )xxqfs+) ray is at an angle of $17.0^{\circ}$ to the normal. The index of refraction is 1.33. What is the angle in the water?

A. $22.9^{\circ}$

B. $22.6^{\circ}$

C. $18.3^{\circ}$

D. $12.7^{\circ}$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An oil layer that is 5.0 cm thick is spread smoothly anssj88hyac +xom47w q9po w /(wd evenly over the surface of water on a windless day. What is the angle of refraction in the water for a ray of light that has an angle 7spowa h4jm+cow 9q/8swx8y(of incidence of $45^{\circ}$ as it enters the oil from the air above? (The index of refraction for oil is 1.15, and for water it is 1.33.)

A. $27^{\circ}$

B. $32^{\circ}$

C. $36^{\circ}$

D. $39^{\circ}$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diver is 1.2 m beneath the surface offmfop;zcdg f)u* /n5v 515qgi a still pond of water. At what angle must the diver shine a beam of light toward the surface in order for a pe*vg/gni5zq ; 1fu)5op5fdf cmrson on a distant bank to see it? (The index of refraction for water is 1.33.)

A. $41^{\circ}$

B. $49^{\circ}$

C. $59^{\circ}$

D. $90^{\circ}$

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96#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A beam of light, traveling in air, strikes a plate of transparent material atjzlsgvpeh995q o:)c)mz - h/j lkvg7+ an angle of incidence ofcz+)7m-h g)pj9 szl vhoq59:vglj k e/ $56.0^{\circ}$. It is observed that the reflected and refracted beams form an angle of $90.0^{\circ}$. What is the index of refraction of this material?

A. 1.40

B. 1.43

C. 1.44

D. 1.48

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97#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A beam of light traveling in air is incident on a slab zpn+x2q exbgrx-y/v /22a : o;cif;bx of transparent material. The incident beam and the refracted beam make a y;/xx +n 2ei brgxc/fapv:o b2z-2qx;ngles of $40^{\circ}$ and $26^{\circ}$ to the normal. What is the speed of light in the transparent material?

A. $1.0 \times 10^{8} \; m/s$

B. $2.0 \times 10^{8} \; m/s$

C. $2.3 \times 10^{8} \; m/s$

D. $3.0 \times 10^{8} \; m/s$

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98#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A substance has an index of refraction of 1.46. ;wodah;wzx-/y)q js-f6k ;+t k3lqvmLight is passing through it at ;)hxw-+ qakm/osvlf z36kq; -wt d;jy$53.0^{\circ}$. At what angle will it leave into the air?

A. It will not leave.

B. $59.1^{\circ}$

C. $43.2^{\circ}$

D. $33.2^{\circ}$

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99#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the critical angle for light traveling from/rj z1ze9nrwl s fz4c*w oc375 crown glass (n = 1.52) into water (n = 1.33)?e3 4srrfj*l 5z z/czcn ow17w9

A. $42^{\circ}$

B. $48^{\circ}$

C. $57^{\circ}$

D. $61^{\circ}$

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100#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lucite has an index of refraction of 1.50. What is its critical v +cbl)7kd,fkwvevt.by z8(1angle of incide,1lv). b ykkftdve(c7wz b8v +nce?

A. $11.6^{\circ}$

B. $15.4^{\circ}$

C. $41.8^{\circ}$

D. $87.4^{\circ}$

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101#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An optic fiber is made of clear plastic wa+ xn.qnbm u4tyf+). czm(e -yith index of refraction of 1.50. For what angle of incidence will light remainnu (4qymx.mc .y+baef)n-+t z within the plastic "guide"?

A. $>23.4^{\circ}$

B. $>38.3^{\circ}$

C. $>40.3^{\circ}$

D. $>41.8^{\circ}$

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102#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The critical angle for a substance is measuredn5, h5n (2s5p wg y8pebmzcyta)3+zhk at $57.3^{\circ}$. Light enters from air at $45.0^{\circ}$. At what angle will it continue?

A. $34.7^{\circ}$

B. $45.0^{\circ}$

C. $53.7^{\circ}$

D. It will not continue, but be totally reflected.

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103#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters a substance from aitg:ut iwyo2nj8e+*1 dd;f u0tr at $30.0^{\circ}$ to the normal. It continues through the substance at $23.0^{\circ}$ to the normal. What would be the critical angle for this substance?

A. $53.0^{\circ}$

B. $51.4^{\circ}$

C. $36.7^{\circ}$

D. $12.6^{\circ}$

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104#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An optical fiber is 1.0 meter long and has a diameter of 20 mm. Its end- v qg1r*bktaoc5zq4 voc .c11s are perpendicular to its axis. Its indcqocrgq a4 c*.v-11v1btk5oz ex of refraction is 1.30. What is the maximum number of reflections a light ray entering one end will make before it emerges from the other end?

A. 42,000

B. 26,000

C. 24,000

D. 18,000

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105#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 40 cm in front of a 20 cm focal length cot98nf;ynp q :knverging lens. How far is the image of this object from thepkqf8:t n y;n9 lens?

A. $40 \; cm$

B. $20 \; cm$

C. $13 \; cm$

D. none of the given answers

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106#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 12 cm in front of a converging lens with focal length 4 cm. W1axf(tc1f) x bhere is thex()c 1xtabf1 f image?

A. 8.0 cm behind the lens

B. 6.0 cm in front of the lens

C. 6.0 cm behind the lens

D. 4.0 cm in front of the lens

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107#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 15 mm in front of a convergi1: kpx/5wob dcng lens, and the image is 4.0 mm behind the lens. What is the :owc1k /5 bpdxfocal length of the lens?

A. $11 \; mm$

B. $5.5 \; mm$

C. $3.8 \; mm$

D. $3.2 \; mm$

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108#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 14-mm tall object is 4.0 mm from a 1/jfddbo2* +9:kk7 x 5ixvjgvtksx 6oconverging lens. If the image is 4.0 mm taxjtg +6v5: x kf/7dojo* kbx9dk2 1sivll, how far is it from the lens?

A. $14 \; mm$

B. $8.7 \; mm$

C. $1.4 \; mm$

D. $1.1 \; mm$

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109#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When an object is 40 m in front of a converging lens the inverted image ifilt1xs nll in 9;0 8s-,jwp-loqui1;s half tl0q1-wlt1 -o ,;xf9s 8innil;psuiljhe size of the object. What is the focal length of this lens?

A. $13 \; cm$

B. $20 \; cm$

C. $40 \; cm$

D. $53 \; cm$

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110#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image is 4.0 mm in front ofi8o j0 mv 3aw0r jb.w0ez07wgf a converging lens with focal length 5.0 mm. Where is the objec .ge3w0fm078 00 vrbo jzwijawt?

A. 2.2 mm in front of the lens

B. 2.2 mm behind the lens

C. 9.0 mm behind the lens

D. 20 mm in front of the lens

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111#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 4.1 cm tall, and br0vzx 8x(5bf10.3 cm from a converging lens. The image is virtual and 6.2 cm tall.x fzx(brb850 v What is the focal length of the lens?

A. $6.8 \; cm$

B. $10 \; cm$

C. $16 \; cm$

D. $30 \; cm$

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112#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 15.2 mm from a converging lenspzj:5 ,2pon(+vxp z az. The image is 4.0 mm tall, and 9.0 cm from the lens. How tall is the :z +z5px poa(2,zvnpjobject?

A. $6.8 \; mm$

B. $5.4 \; mm$

C. $1.7 \; mm$

D. $0.68 \; mm$

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113#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When an object is placed 60 cm from a converging lens, it forms a m dx.j2z0c :uw5 (lrzereal image. When the object is moved to 40 cm from the lens, the image moves 10 cm farther from the lens. What is the focal lj x(mcz:e dzu0 l52r.wength of the lens?

A. $20 \; cm$

B. $30 \; cm$

C. $40 \; cm$

D. $42 \; cm$

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114#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a distance of 30 cm fro5xxs qz - y8z *,gpiigz*p7 4w8baxm8fm a thin convex lens. The lens has a focal length of 10 cm. What are the values, respectively, of the image distance and lateral z p*8fixxzymqp -i84z8a 7xs,gb 5*gwmagnification?

A. 15 cm, 2.0

B. 25 cm, 1.0

C. 60 cm, -0.50

D. 15 cm, -0.50

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115#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at 30 cm in front of a diverging lens with : *ej vrud 52qd hs(4dbb3)lbsa focal length of 10 cm. What is the imagrbhusq(bds*4b532 jde ) v l:de distance?

A. $7.5 \; cm$

B. $-7.5 \; cm$

C. $15 \; cm$

D. $-15 \; cm$

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116#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at 30 cm in front of a diverging lens withor.fo;q kzf:xn o24,m a focal length of 102 zk;f n4 oxof,.orq:m cm. What is the magnification?

A. 0.25

B. -0.25

C. 0.67

D. -0.67

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117#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 10.4 cm tall, and 4.t*ya7che jq2a nlm417 8 cm in front of a diverging lens. The image is 4.0 cm from the lens. How ta2 lja4c7 q1a *thy7menll is the image?

A. $13 \; cm$

B. $8.7 \; cm$

C. $5.4 \; cm$

D. $1.8 \; cm$

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118#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 6.0 cm tall, and isvouomh7lwwf4ym )s h 67mo //p r1pu6* in front of a diverging lens. The image is 2.5 cm tall, sy mh*oorm/uu6 v167fpwml7)pwo/ 4hand 7.5 cm from the lens. What is the focal length of the lens?

A. -6.0 cm

B. -7.5 cm

C. -13 cm

D. -18 cm

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119#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a disnsvbj fw mq7x 0vc l8v*u6k8(1tance of 40 cm from a thin lens. If a virtual image forms at a dista67ub0*lvjv(nsw x 8kmc fv18q nce of 50 cm from the lens, on the same side as the object, what is the focal length of the lens?

A. $45 \; cm$

B. $75 \; cm$

C. $90 \; cm$

D. $200 \; cm$

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120#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far from a lens of focal lea t/ s 5by1 ysxo0wotsn+2:yw1ngth 50 mm must the object be placed if it is to form a virtual wt1/ o syy n+sxbtasy 5o012w:image magnified in size by a factor of three?

A. $33 \; mm$

B. $42 \; mm$

C. $48 \; mm$

D. $54 \; mm$

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121#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far from a 50-mm focal length leak;ttzb,1 /or c1l)a tns, such as is used in many 35-mm cameras, must an object be tbr/,) ;otclza1at1 k positioned if it is to form a real image magnified in size by a factor of three?

A. $46 \; mm$

B. $52 \; mm$

C. $58 \; mm$

D. $67 \; mm$

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122#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two very thin lenses, each ,g+okhneg* mqo ylr8zf u5* 4:with focal length 20 cm, are placed in contact. What is the focal length of this compound lens?ku,+h:g *q zy5l*mr4 n8oogef

A. $40 \; cm$

B. $20 \; cm$

C. $15 \; cm$

D. $10 \; cm$

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123#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A double convex (convex-clhssg f1txru5; ;a(lt-y(s 0yt*m3 vrcm8b9nonvex) thin lens has radii of curvature 46 cm, and is made of glass of index of refraction n = 1.60. What it ;uv 5y(b xflr8s ms9n-m ls;tgr c(*10hay3ts the focal length?

A. infinite

B. $38 \; cm$

C. $30 \; cm$

D. $18 \; cm$

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124#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A double convex lens made of glass (n = 1.50) has a radius of(3k/ p2lmcz 4qb:p zr)u(nw ss xe:uh/ 40 cm on the front side and 30 cm on the back side. What4qm( x/p(e3uh2rp) n kzc:b:usl/ swz is the focal length of the lens?

A. $11 \; cm$

B. $34 \; cm$

C. $80 \; cm$

D. $240 \; cm$

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125#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A biconvex lens is formed by using a piece of plastic (n d/eks;v1 xokmyq 0 *q 8rjbya07il09l= 1.70). The radius of the fron*y d0 li kl8skb yevqq17xom090r;aj /t surface is 20 cm and the radius of the back surface is 30 cm. What is the focal length of the lens?

A. $17 \; cm$

B. $86 \; cm$

C. $-86 \; cm$

D. $-17 \; cm$

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126#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plano-convex lens is to have a focal length of 40 cm. 3bpqgw( y hh5:8toa1g-5 cw:it lzn2h It is made of glass of in8 io5hlph3 t:wqc(w-2a5h :g by1gtzndex of refraction
1.65. What radius of curvature is required?

A. $13 \; cm$

B. $26 \; cm$

C. $32 \; cm$

D. $36 \; cm$

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