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

1#

Reflection, refraction, and the formation of images by mirrors an,fe 5x :n2ffcj3ng hn3d lenses has been successfulj,nc :xhn3f2 ef3gfn 5 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 incidence myas, sjg..qjmm /*+i

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 .;) m,qgm bqivwork 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 formse j s3 vow(jy+9n)r b(ptr1t:kh c,it/ an image 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 imagys8fw 6 l(d7oyz3pa8ges 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 not);ug1 b +tk .tf8tr:nqd hqjgnh0,-dj actually pass through the image location, a -n8d0 r+qf kdgg, )ju;hqtbtnjth.1:nd would 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 xsr;o;,u4a dithrough the image location, and could appear on paper or film placed at u,i;sox4ra d;the that location is referred to as

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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 virtual imageem31tq9hah6y ?

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 s-a;px qjds 4a.*hq0; 5lnnwe kurface of the spherical shape is referred aq5l-0he x4;* ;kpn wq sna.jdto 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 place on the inner surface of tgii0y+ebgj/htyyj,;+r p- 7y1.t mishe sphes 7; - /tyip1j.yb,h0 +gegtjrm+iyyire is referred 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 curvature of the concave mirror is r, them7esp* j:k n(4e a,slw 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 wzb +1d:ju 6veconcave mirror's axis, strikes the mirror's surface near its midpoint. Afterdu+:wb 6z1 jve 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 on a path parallel to the ahl2s h5/ hd0q;cdmpherhnqvz7/8q 79 xis 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 mir/ jj /v0doas(cror's axis, crosses the axis at the mirror's center of curvature before striking the mirror's surface. After / (j sv0dja/coreflection, 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 on a path through the center of cui( fxqnfui *5):iye d7rvature is reflectedieu:x )iyn7idf( f 5q*

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 to a cornx0 r hp gsy331ebz81w5; wkrncave mirror's surface, crosses the axis at the mirror's focal point before striking the mirror's surface. 5rr1pkx;8y wzhr eg3 nb30sw1 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 qe8d . puiktt ix jl k::e-80;;cho;baon a path through the focal point is reflecte kt x ik8juo;-;:;0h:batlcd.8p q ieed

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 finding the .,cs bg0w-0imma b9hm 1rtsw ayewg5 1*jx:6 iimage position due to a curved mirro b0gb:56 ,xcmjy-.1si ge* irw0wtwmma19ashr.

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, exacm6 wigm9yne;t/1gv )dtly at its focal 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 cov/p vwd7.2acpt(w) uyz p r-t3ncave mirror's center of curvature. The image produce(w dtv2wy3- )up atv c.zp/7prd by the 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 mirror's center of curvature)6 ;kgendjj4 w and its focal point. The image produced by the mirror is loca4n6ew) kdjgj; ted

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 surface9e,1:t jy2 dmzv )f :dklvt;:t mgez.v and its focal point. The i,lzzvdv.9t:j:f tme2emt;vkyg1d: )mage formed 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 mijvdgcfa4 :pz2z-.a:( nay kko3:uu,j rror, at the same distance from it as its radius .kjgzf:(-ja:zc3nud4:pu2ov, aa y kof 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 mirxo*9n1 t9g kriy-hv5gf5cs, dror, at the same distance from it as its focan -ifk 1 5sc995og rty*,vdgxhl length,

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 look into a curved mirror you see a magnified image (a gr az,*m n.nphkl001z hkeat big you) and sometimes you see a diminished image (a little you). If you look at the bottom (convex) side of a shin01zmp0hnkkaz.hn,l* y 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 mirrors produce czk )b*d /ec.dimages 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 mirrorsmq:w /uwmz:pqn 6n*r7 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 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 mirror produces andwp,sg0:zrk )kz+m4 s 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 spherical mirror prod4r*k2 oof5vej uces 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 magnificatl ,zaiu /9dax/ion for a mirror means

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 e8 r,db,3ns j+5/: gkb tkezhjis

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 image formed is0st 50k8bt(xt dwyidz7 f,lg6

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 pos +4y3 2btj vgx1qh(oifitive 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 imagr3 64wmypkva :e 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 magnification is larger than one, then the 8;)i1ky0zmw7s)uvp 6 6rc qvttgge) z image isg;iym)8uwt7p)e cg6 s zrvv0 tqz6k)1

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 the magnification is smaller than on9d+pu .snvu*r/ boee-e, then the image is *v- dubruenoe9/+s.p

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 magnifr-i* 9)*/b 2rp*nbl,- i6wwxvzgdatjxum xm.ication is equal to one, then the image 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 fastes/7caydqy scs,b)xx4 f adu xyn-ddp/0y++y ,9t

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 retan1s6xp94pbn2,ri12+a pu c xoy, defraction

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 less than one for a m5ymedq3 w20mpa ,3 emf*e9bhfedium 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 diami ,q(u ;l3ngu;:1m4fn dgsc nsond 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 incidence7qdt: - q;hoelcvd21 k

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 angle into a denser medium is re d7xpewo;r*p34pz ;e zs45a qsfracted

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 watei m(/+i jcsen;r. The angle of refraction 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 5rxf)i .sc/ s+ -ehmjov3;ljrtraveling 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 optic3 u v0rno0/mn sdm4g/ks is 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 b y v))w+lb6u.op pmt,neam of light passing from water into 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 lenses work im(r99(ntpxkga33) :dt dasaj s

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 th hm 1)z ;fh+1katb8f 9 .-)fuulcnlikne 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 call hrcoey+2d2 p7ed

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 ae l t0f ni+ s3ti5o. h7yfl36bnysr;/kt 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 6 pfb(thmspsv5r09 s wfo9(f5are similar except that lens B is rated at 20 diopters, whereas lens A is rated at 10 dioptespfpsb0w5(r 6s9f9t vfo(m5hrs. The 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, )g3xf.+dch a1 gfnwi (strikes the lens near its midpoint. After traveling though the lens, this ray emerges traveling obfih.wfg+ dxc gna()31 liquely 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 (8e5y pn w r+vj7l9/)9eynf hj*nlny tthe le9 7w*ntjnlyelynryv 9+ h(/ 8n)5fej pns near its midpoint. After traveling 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 thr6,h3(9p io yra6q*gw,fg2ger s gwq(dee rays for finding the image position due to a thin legsi( wyq,6r , qdr gfgapg6o3e*(w2h9 ns.

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 lengthmsg 4d5y8cw- t $f$. 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 lengthi5nytf7prxkhu yis-(+ u.u,5 $f$. 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 fo,3,4ymrrur9qq1dw bj cal length $f$. 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 l4kpl *:dh7-m o t;oihlmq.u/bength $f$. 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 focal len(k 2b: qhm2 ;x3 she45iupbfmdgth $f$. 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 lens and its focal point. ;q-hpl8z m*5wfnxvf8 The image formed fz;pv nf8 *xwlqh- 85mis

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 con-xqv eupv.q7b 5fd)/s rj)zl+g3y:k gcave lenses

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 stamp yokw w ol/p-e. 40bab,duu 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 is placed aee9 .ml+ i; .btu:b2iqmnp y-m converging lens of focal e9lp: qt-n2;ib .y+mu imb .melength 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 fh i /q:mit-ef8ocal lengths $f_1$ 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 ar.kz pay;r74x,r2o .wpb do ha;e placed in contact. If each has a focal length of 20 cm, 7y;4x;.aw.hdrzo2 kp o b,prahow 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 .lxen4;y rol adb:7( ddx1+ub)0jpk langle of incidence of r1ldo n :e0a k;p7 )jydllud4xxbb.(+$52^{\circ}$. 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 form a di5p22yx y8 tp1w7jw*kof8zvu*h.red by the mirr a1fdw2prx5j o*wp8.2y i7ut8vky*hzor appears 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 0.7b9/xqiozrvu*c msf dmfkz+;:f. j 0z+2 g-5sg5 m in front of a vertical plane mic rju-s o+zz9.fi ; m/sg qgk+2dbx*05z:fv mfrror?

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 your image when you approach a vertical py-hzh6jg 0j 8klane mirror at a speed of 2 m/s?6kj80yj-hz hg

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 razf. a6;poy*b9 uk c/zwdius of curvature of 20 cm. How far from the mirror is the focalpk;zzc b* of 9wau6/y. 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 radius of 20 cm crean 1 jk,:/uq q*fffuw*dtes a real image 30 cm from the mirror. What is the objeq/ nufjqwu*f* f: dk1,ct distance?

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 ljnvh/ 3u6p +zfront of a concave mirror, and the image is 3.0 cm in front of the mirror. What is the focal lengtl6n j3/hpvu+z h 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 ww)6me fr; i.jk czb52,tbor;focal length 3 cm. Where is the imagej.)w; tzb6 5bm2r erckfo iw,;?

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 of 20 cm. An object isjd/. ds4 p71be4u0 u ppr*dmzk placed 10 cm in front of the mirror on the mirror's axis. Where is the imagmp47sjdu e*k1p bp4d/0duz.r e 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 focafv7(f -)6 rjr0nqokp vl length of 20 cm. An object is placed 30 cm in front of the mirror on the mirror'sr0o6-7rnq vvkf( )j fp axis. Where is the image located?

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 imag4dx eonbo v,s59ow*v 3e is 4.7 cm tall, and 10 cm from t3osoxdn*eo5b9,v w 4v he mirror. How tall is the object?

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 of focal length 20 cm. h7 c lkkr9 (p6igjm3i4The object is 4.0 cm k 79kipg(l4c6hm 3 irjtall. How tall is the image?

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 tall. The image (5gko+au moh 77y-edp h4d-lais 38.6 cm tall, and 14.8 cm from the mirror. How far is-am l (5hdk7+4h e7ao uop-gyd the object from the 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/qxi5msne v27m(l (ft.0 cm tall, how far is it from themns t(velfx5(/7i2q m mirror?

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 mirror of focal lengthri f8x6)vtkf + 20 cm. The object is 4.0 cm tall. W68it+ f xfrkv)here is the image located?

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 front of a cosmetic mirror (concave mirrorw*w8oqn +p9 9l*n:xeouxp n+y ), the erect image is twice the size + ne pq9nop8olnw:y9xwx +* u*of the object. What is the focal length 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, znzv hlz f;z9k7ff.w(mm;m9 cm in front of a concave shaving mirror. If the image is an erect image 1.5 times as large as the objectm;ff,zvzkwf7 h.99(m ;zlmz n, 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. l evv0,1/sh/kfh fy*rWhere is the object?v/h fhvr/*ys01f ,lek

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-m7: u0 dl1b2or lzcsq of -20 cm. An object is placed 10 cm in21m7dl- :0rqulsco zb front of the mirror on the mirror's axis. Where is the 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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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex spherical mirror has a f5sedhz( *tetm//t7kcd6g v b9 ocal length of -20 cm. An object is placed 30 cm in fron6 ht/gedb5me (v7cd/s zkt* 9tt of the mirror on the mirror's axis. Where is the image 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 convex mirror. Thexu0x3g zypjp8 ,m-tvnxj4 9/bq)l. je image is 5.8 cm behind the mirror. What is the focal lengtg.p48xb/x vy9)z03nux-lp et jj,j mqh 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 7.80y*9mvmc)o;zlq2dl myly7) v6- rh)j4yc ng0h cm tall, and 14.8 cm from a convex mirror. What is the mirror'2ndm lh*hcyv 0-y9jml))7lyo mgqzv4y6;c) r s focal length?

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 indz0ld fi9n0(mb d/s7.vxeul d 9ex of refraction of 1.50, what is the speed of light through it9x dfu d0vzed ll(0 nsbm./i79?

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 gla,uesoyv3-e:i t: j(xass interface 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 atfu/ q)hsbcn d861cki ( 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 inc il f.zva1: k*shd9tt 9ra+hi-oming 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 smoothlmioj. yot46e6 a:sbezia)9 u -y and 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 hase)y.4 t96 -uoi6z jaao:esmbi an angle 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 of a still pond of wadi xxpq 7,+e- rs u,,+c1xxuvrter. At what angle must the diver shine a beam of light toward the surface in order for a person on a distant bank to see it? (The index of refcxx 1,-pexv,i+qrdru+ su, 7 xraction 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, strike oyi -:/xj :s*;sesxm,grqkx 6s a plate of transparent material at an ae xqs:k:,/i*;g xsm soy-xj6 rngle of incidence of $56.0^{\circ}$. 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 a4q c p/(5i;p71e ooeaoi.ft dqir is incident on a slab of transparent material. The inqoo. ao51f tec (pi/p;4idq7ecident beam and the refracted beam make angles 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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教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

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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. Lightauef1a k925 ct is passing through it at uc5f12 ket9aa$53.0^{\circ}$. 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 crown glassdb :ua08q1vlh (n = 1.52) into water (nq10av lbh: u8d = 1.33)?

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 re0h0, fg*qvm 5ubd nm2efraction of 1.50. What is its critical angle of incidenc*mhq vb5f m0d n2u0,ege?

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 witf8j*2qv 2b+2jchgg mp h index of refraction of 1.50. For what angle of incidence will li2jv m bf2c8jgp2q+*ghght remain 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 ispcp32rd;0v fl measured 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 airw2k-b9yn; *p 9r9bkeayf 1w jyj-kaa2 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 f uq4avf8q; xqj s9o9;mm. Its ends are perpendicular to its axis. Its index of refractio8;qqjvo9s ;auxf4 q9fn 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 yb 2ji 79hxs.even+g2 length converging lens. How far ij7h x9gb+ se.2 ieynv2s the image of this object from the 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 conv.pr-f1.o yt3ocg6g u qerging lens with focal length 4 cm. Where is the ima rf61q-.cg.o uyt g3poge?

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 converja 6w kw)vvy5c6iz u) .;d+msvging lens, and the image is 4.0 mm behind ty ;mwj5. dv6)6kv+ cu)zisva whe lens. What is the focal 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 convergin2lrhw(;-muz( dag)s6fre x 6(cr1jdrg lens. If the image is 4.0 mm tall, how farg rs-r2rujc dwza6e lr1(x;h)(fd6m( 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 q5 hfm7pd/g b7, k d)bnvwl7go7pj.u(in front of a converging lens the inverted image is half the size of the object. What is the focal length of this len fjpbn7luv)b 7wdh(d7kmo.pg,5q7 g/s?

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 of a convera o2 q)rp1*7xvtrz6qrging lens with focal length 5.0 mm. Where)rtvx* 6rrq2z ao17qp is the object?

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, avg e 7 6met.g32nv1euand 10.3 cm from a converging lens. The image is virtual and 6.2 cm tall. What is the fu 2evmn agee3g.v71t6 ocal 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 lens. The i42;/vyezuq6 he,w 0xuy tpssainppz x,),70kmage is 4.0 mm tall, and 9.0 cm from the le72pv/0y ,sz, )uh y ewnupxxpe6s4z,q0i;aktns. How tall is the object?

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 pl 9as5 vhgms54eaced 60 cm from a converging lens, it forms a real image. When the object is moved to 40 cm from the lens, the image moves 10 cm farther from the lens. What is the foca 5em59h4savgs l length 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 distance5a3k( ge hbw;c of 30 cm from a thin convex lens. The lens has a focal length of 10 cm. What are the values, respectively, of;5wh( gbe3ac k the image distance and lateral magnification?

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 fro8 e )bmk3cmfyl;p1,17 lmqtqvnt of a diverging lens with a focal length of 10 cm. Wh 7b1c8fq;l3 ,kyetmv q m1mpl)at is the image 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 divetwvri*z9cgb5)3zr+(/k n(jqept6 j hrging lens with a focal length of 10 cm.63 c/*p zge)hnqrr j (ji5+tt(9k zvbw 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 4.8 cm in front of a diverlrb:-;d(, t :vansttoging lens. The image is 4.0 cm from the lens. How tall is the idat-ns,rtv t; b :lo:(mage?

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 is in feryzgr2l 1 v lha9y(*s-6t(ni4* wkb oront of a diverging lens. The image is 2.5 cm tall, and 7.5 cm from the lens. Whayz*e*l(- b 9tr21ikngsh(a lor4w vy 6t 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 distance of 40 cm from a thin8 li/zcmn(.amc,d t,p lens. If a virtual image forms at al m/ ,.zm n,8(dcctpia distance 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 lengjr,o475t xh exth 50 mm must the object be placed if it is to form a virtual image magnified in size h 4ox7,xt5ejr 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 lengqt7ptgzas/9 bh)f;ln-j /y(k4;tmm ath lens, such as is used in many 35-mm cameras, must an object be positioned if it is to form a real image magnified in si(q)fk9/h;lnmja bt7 p;y - 4/mtatsz gze 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 with focal length 20 cm, are placed in contact. Whatqmv1mwe j x apz0k75ob 8 t:m;n3nj*2v is the focal length of tea *n wqm28 ovmztxj;0j k 7:15v3nbpmhis compound lens?

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-convex) / q02m5ygpnpgk9y st( ww; vs*7:miql thin lens has radii of curvature 46 cm, and is made og sp p:5vw(ik/ms92n qywyg0l;mt*q7f glass of index of refraction n = 1.60. What is 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 40 cm on th jft6l )be;kno0+ul9 ko;kl m)e front side and 30 cm on the b;olkt 9fb+ln)kk;6j lmu)0eoack side. What 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 um cqv606c h2t 6ovlomslzh)39sing a piece of plastic (n = 1.70). The radius of the front surface is 20 cm and the radius of the back surface is 30 cm. What is the focal lengtqzlch 3l 9hs6mv vt66cm o)02oh 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 ucy1,*s9 irctio;0jv focal length of 40 cm. It is made of glass of index i1ct0soj,; v 9c *yruiof 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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