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

1#

Reflection, refraction, and nd :tffo onydz04(l: i+ad)l 6the formation of images by mirrors and lenses has been successful described)nno:l df f4o 6+l d(0ayzti:d 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 z fpauuax ycbt5:h0+ 1kgy831

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 work is,ylyrb,+i-r s.vya4o

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 image try9yfb* ct:m5hat 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 imagesa 4vhb5h0mgn+ *zbh ./7dqvpq 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 actually pass throa3lw b 9cuuw:1,5xfbfugh the image location, and would not appear on paper or film placed at that loc95 bw3, alc1ubx :wfufation 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 u)y4ly+in0 d p ,eiai.light rays pass through the image location, and could appear on papepy4l. n i0)+da,iiyeur or film placed at 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 imag7mh1qgjv gu :3e?

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(jxi/3 jpp9rhweu z 5; reflection takes place on the outer surface of the spher uw9ippj/5;(jh3 zrxeical shape 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 onqm wue8k8 -5ej which reflection takes place on the inner surface of the sphere is referrkum5j wq-e88e ed 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 mirro)wv yshgp3 nt7.1 rs3wf. (urpr 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 c-5qmluw6e b p,oncave mirror's axis, strikes the mirror's surface near its midpoint. After,b6e-mp u5lqw 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 cqi s)f qb2pf:z;mbn) ,oncave mirror 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 obliqulj:y 7w3rm5 h nzr(x*xely to a concave mirror's axis, crosses the axis at the mirroh*57n xly:rwj rmx z3(r's center of curvature 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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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 thro9vaj/c 0i)+brzzcp*a knnj :1ugh the center of curvature is rbziar1 + vjcn*c k/0zj9n ):apeflected

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 concaveqi 95e. *a, zt6pwmpdl ff4vl: mirror's surface, crosses the axis at the mp .:f 5l*edz,vimfl q w4a6t9pirror's focal point 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 on+gs+ q;vrik/ 31igp5g md)hhn a path through the focal point is reflected5m+ ;ihggnqph3/d i)v+ 1skg r

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 image position due to a curp mnh .spb-k5h2/u,yrved /,pm 5uybnkp-.2rhhs 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 ofky *,d :-cspjjsh9rrs3n i 1)k a concave mirror, exactly 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 concave mirror's ceg/ccrxfi ,o i;:l za,j0 04afinter of curvature. The image producedf cafj04ioc,lzia;rx i0g,/ : 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 positio97njx9df /(l o yfz1waned between a concave mirror's center of curvature and its focal point. The image produced by tff1daz(y w97 nx9jl /ohe mirror 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 surftt7fg*ly v4. aace and its focal point. The image formed in th.y atlv4* 7gtfis 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 distanl +6bicchsrw*e693 o sch(mh2ce from it as its radius of curvatur*23ws9+( c 6cris6hm hhce lboe,

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 con/m : ric-x++yye9;0nllfy1dre gmxz:vex mirror, at the same distance from it as its focal len/ilezmn0 yy-9 mcgx+re;f:r yxd1 +: lgth,

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 imkp61l po;r81i pnwe3+z(j c bpage (a great big you) and sometimp8p+p (c 1oi6lr 1k3n jwezpb;es you see a diminished image (a little you). If you look at the bottom (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 miu)elqg qngl . z/d9y/7rrors 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 imag4d1 wen(ztew) es 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 mih+dw.y c)*ljg3i :)3p:l2ait bqx vfnrror 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 spherical mirror produces an image w:ktwi6.wnw1t9q a n ozy92d*dhich 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 mea)sj8nqvkh* 9 (ggsgh a7+o vc8ns

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 positive3p73y 6mgcd fjh uuj8 ls6tk76, the image formed is

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 distancedab5y+b1 alutr 8+y; k is negative, the image 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 jz4y4jv. i*l jbt ry.5is a positive 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 i/w1rge21hpxku*2vg f 7(xm jwmage 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 lark1 c(0vukg wp9, acq8uger than one, then the image isv0kgqpc cu 9,wauk( 81

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 one, 21d )up6o garm8u7da1 t(mapwthen the image is7r 8oa1wad16mp2da(umg tp) u

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 equalvlw g a( pj4s;h;6*vjk 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 fastestbu7uy8ef.m2 m8x 0 idt

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, t(u+:cifye 2cl1;iy 1oj /g xhvhe index of refraction

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 ajzo.a uy*g k8u/5 co9s 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 diamond is ts 2 *bntlku9;wivf:1$2.42$. 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 incidence qke(j w.k7gwn6c)kvu0,p; gu

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 a6bva8 fcij2 u;ngle 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 refrao k,h +dpw3o6besy;0ctm)8 q n tv-.kjction 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 traveling in air, is incident on a glass platev vpjj5fjp 1/4 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 0os,yj3 7/)s uzq bpfzfiber optics 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 beam of light pxm* c+mbh3y3qassing 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 lffiu a++ow0d7h7b+z3 8vmlq adg3o)renses 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 thickvevb z+jv/y;izg1o/;fki 9 n. est at the 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 thin1k:hmut zy(5gd6, ksi6 ;fnlaner at the center than the edges are called

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 at the/x zmmf37d1l5m7tm j6p0w6kt ipl r.g 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 thatx k2 e0ohu2x,l6brjr/ lens B is rated at 20 diopters, whereas lens A is rated rk x0,26xrblohu 2ej/ at 10 diopters. 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 paral af*5a,hwhty4 x( i1tolel to the axis of a thin concave lens, strikes the lens near its midpoint. After traveliah(i5owt ft 4ahx,1y *ng 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 conve / u kjlk(1i2o3ei+nx *hbn*eqx thin lens, strikes the lens near its midpoint. After traveling through the lens, this ray emerges traveling obliqu1 2k(/kn +e*jxqniohi3el*buely 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 thrwh bh39wyc,z) ms: 3qew;pmgb +g4y.yee rays for finding the image position due to a thin len):pgsq.b e4z h;gyw b+my93 3,hwcwmys.

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 leng+ zwqdrftpk59 6; xwd*c2iad; th $f$. 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 l8j4i q /erv *s 2lbzx6mys32fuength $f$. 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 length iatha3/ ads. f xmo9;9$f$. 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 lengtia krq8gnf; hpg6jd1; ,g0/o ph $f$. 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 focall tn xs+qj*7-f 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 iy. pv 2nfp++ 5*j(c ubdnjkg9lens and its focal point. The image formed is c(gduijf9pnnj*5k2 +p .v yb+

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 len(m / t3)mnqdxnses

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 you seejew/*.p -ws1j2sthj y 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 plai9j(uk2 a 5l axztw3+tced a converging lens of focal length 24 cm. The filament of the lamp can be t9+ja 5xla(2 w3uzkti 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 lengtvbd+wnj d5(t n2n /du6np5jge);rk)jhs $f_1$ 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)r,o; hv5mn3u*p+e vlt lenses are placed in contact. If each has a focal length of 20 cm, how would you expect the combination to f+,pm v to;r5leuhv* n3unction?

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 re9rudg-2v h(lk wq yuzv(c q4r,+jud7*5aw ;eaflecting surface with an angle of incidence of 2z9 +av*au(u c7w rre,dyv5-h qudglwq4jk(;$52^{\circ}$. 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 fron8o ll86 h5gzrwd-hx7/cdk 3 jrt of a plane mirror. The image formed by the mirror appears to 3hlrcd 8hxgrzd5low/ k-678 jbe

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 whe p+b;rvdxmbdd :il f.7;2 a8sxn you stand 0.75 m in front of a vertical plane pxia;87fdbd:bd +;vs l.x2 r mmirror?

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 yoiq vu( l)kplf54j+ j1lur image when you approach a vertical plane mirror at ai+(lkjvq uf51)ll4pj speed of 2 m/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 hfn*,mt8ylvkn96 (bl radius of curvature of 20 cm. How far from the mirror is th(ymk8ftnb , 6vhll9n*e 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 radius of 20 cm creates a real z (-tm x:ri+m9nzz:9valagw1fc 5pu 4 image 30 cm from the mirror. What is the object dirgc - pu+:51f 94nzzzlx m(9v:ai twmastance?

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 the image iscwmy*nc))u- :rn.k rr 3.0 cm in front of the mirr.c- mnu:kcr*w y r)n)ror. 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 fron+zfoz frg c d1x,,69hjt of a concave mirror with focal length 3 cm. Where i ,c,h6f z9odgfjx1rz+s the 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 of 20 cm. An object is placed 1munbf..lpfiu4g .ziwohn: k8;f*+i0 0 cm in front of the mirror on the mirror's aon ;. nf8miuu0lpw +.i:4 ff.gkh*izbxis. 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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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave spherical mieyj 5ec5of- 4:g9dhh n*gch3trror has a focal length of 20 cm. An object is placed 30 cm in front of the mirror on5hgeg hy *et53o 9-hj c4fdc:n the mirror's 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 image is 4.7 cm tall, and 10 w l c2q,,)qw4zm p/procm from the mirror. How ropc,2,m)wqlw p /z 4qtall 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 ofg k7g2/t jbj*ycz+ej4 focal length 20 cm. The object is 4.0 cm talljbtcgk */yj47g2je z +. 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 is 38.6 cm tall, and 14.8 pi (1 7hz 4olgm8 hx,yfixz68ucm from the mirror. How f61iuz(p4iyhxx hm8z,7lgo f8 ar is 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 e.+j/ l(mb mgnfdh y 5c4s+c9wfrom a concave mirror. If the image is 4.0 cm tall, how far is it from the wgfemd/hb45 nc.9+y(smljc+ 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 focgk0- iwb -dovb11qye 5al length 20 cm. The object is 4.0 cm ta-1 bb i-wqokde0y15 gvll. 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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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a person stands jg3 rops5),tk40 cm in front of a cosmetic mirror (concave mirror), the erect image is twt)r,gs3 oj5k pice the size 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 cm in front of a concave shaving fgdwj+ kw*p5(mirror. If the image is an erect image 1.5 times as large as the obpf*wj (5g+dkw ject, 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 be52rrpmewz/. rhind a concave mirror with focal length 5.0 cm. Where is the objecemr5 p/z rw2.rt?

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. (knieq*i /la3a-otbw *++ckq An object is placed 10 cm in front of k*qwea it/ c-i*a3on+qbk+ (l 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 focal length of -20 cm. An object is plak/mofn3-dap ;o c/1be ced 30 cm i ode3c;of-n/p / b1kamn front 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 coxjf xm9 0a9rv -w0*vamnvex mirror. The image is 5.8 cm behind the mirror. What is the focal le0aj0mx-r9 vwvaf 9x* mngth 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, and 1+t 5cb2 qy0divy1dq(1 qumk r74.8 cm from a convex mirr (y1 cdk1bty275uidv 0mqq q+ror. What is the mirror'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 ind4/uy+.ucr r;;5z;q4t l, wbn xbxfrnzex of refraction of 1.50, what is the speed of light through it?xzw4q,zryr4l;;;ux.fnn bt5br/ c u+

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 intc*z vat1eqc3)erface 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 substacrzt1 j9a ga:-asg 0z5nce from air at 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 incoming ray is at an angle3n n62wal(m9 oyrm.l g 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 n/xnl6shemz lj7r-8 r43xl4q thick is spread smoothly and evenly over the surface oflnxrl m 3hzn64rs /8x-7 leq4j water on a windless day. What is the angle of refraction in the water for a ray of light that has 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 watezpjne q niyc vm5;(*+b,z jv;7jo)*ug r. At what angle must the diver shine a beam of light toward the surface in order for a person on a distant bank tjo,7by ); um*eqicgnp*vj5(nz ;jvz + o 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, striki*jcbvb.x+h.ax j i2h,*cu,o2cd s) ces a plate of transparent material at an angle x . c*bb vd+u2.hcjcais*)h ij 2,o,xcof 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 air is incident on a slab of transrw- 7x pp.s;d;)y k.fks2 bcihparent material. The incident beam and the refracted beam make anglesk)k;cyhw f .i2pdxp-7;ssb r. 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 u wrn-7 :+dkt5 27npjfg o2mybof 1.46. Light is passing through it at :k2 yubmg5 twnr7-p7ofd2j n+$53.0^{\circ}$. 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 travelc1 g uj wta m.r//u4gfc0w4qam4chp (8ing from crown glass (n = 1.52) into w.4u/1ajc0 mg4uc(gm r4 w/qf8hcpa wtater (n = 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 refraction of 1.50. What -e5ebzo1egzthce6x y/b;6u/b-7j x iis its critical angle of incidence?zou /h6eizec-7;j 6eg/ x-5b1beyx t b

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 plasti:z :tk aagl3j,9x;f rmc with index of refraction of 1.50. For what angle of incidence will light remain within the plastic "guid;ak:gta zlf,rjm:x93 e"?

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 in00t*:809w yy5hetckhua rogs 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 e 6wtwce:wb7.uczw +,air 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 met3:/k/rij uhu0xvexg be f5dc6+yu4 +ver long and has a diameter of 20 mm. Its ends are perpendicular to it +kruu v/5dib:/e + 4xjyfvxg0h3ec6us axis. Its index 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 4kqn4dqf /x 4l6;gsj+w0 cm in front of a 20 cm focal length converging lens. How far is the image of this object fromnd64kqxsw/j4 q +gl;f 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 converging leupwxhxgce4*z5f 4d+. 3xz 7abns with focal length 4 cm. Where is the imx* .dcbx 7 zh3 feu+wgpzx454aage?

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 fwsj mwwz0; 71q uj r25e +ikil wklg3ca4h,u.1ront of a converging lens, and the image is 4.0 mm behind the lens. Whj7j1zu3suqwgi ,w.c wl k 25ml4kr 0;ea1hiw+at 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 converging lens. If th9zyobt :+y+hae image is 4.0 mm tall, how far is it from the lb9+yy+:a zhtoens?

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 invert ,/80;yb(ron qrre mvved image is half the size of the object. What is the focal l(8vemv/r y,r qorn0;b ength 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 f k)i4: qfgg, m5abd- (swn*vfrront of a converging lens with focal length 5.0 mm. Wheref:*wn(q-ma5b g )i, frks dv4g 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, and 10.3 cm from a converging lens. 0l( rdrh0adj* The image is virtual and 6.2 cm r0j( 0dra* lhdtall. 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 lens. The imc kj n0l4 8gb7ppk(4t(pc lj-gage is 4.0 mm tall, and 9.0 cm from the lens. How tall is the object?nblckgp c-p74kj l(8p 4tg j0(

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 real image3-)l l.hccm jx. When the object is moved to 40 cm from the lens, the image moves 10 cm farther from the lecm-c3 )ljxh l.ns. What is the focal 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 distance of 30 cm from a thin convex lens. The ;n,/g(.l1zww2cmt.i y 2qrk g1ekxzscq1k 8llens has a focal length of 10 cm. What are the values, respectively, of the image distance and lateral magnificatirn8ksyg1 q xeci k.z,(wm 1z/ q1;2gk.llc2twon?

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 a focal l, fib24wbt (khength of 10 cm. What is the ima(2 4hw b,tifbkge 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 frohsth:fs zb f7 ah/.*y/nt of a diverging lens with a focal length of 10 c/fbha f7t*s/ hhs.z: ym. What is the magnification?

A. 0.25

B. -0.25

C. 0.67

D. -0.67

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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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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 oftga,yx 2,pfr3.4le9saz 4ddyu 0mj-f a diverging lens. The image is 4.0 cm from the lens. How tall is39aary x,t- pl fz 2m4uej4.sdyf g0d, 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, ac ,hmk(q9b5cxj+em(e nd is in front of a diverging lens. The image is 2.5 cm tall, and 7.5 cm from the lens. What is the focal length of c+ m( (eqh9cbkmj,5ex 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 thin lens. If a virtu6jak8fub 4;tral image forms at a distance of 50 cm from the lens, on the same side as the object, what is the focal length of the lt8 k6br;uaf 4jens?

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 l wc6agnmi- r5vfws,35, opc2of focal length 50 mm must the object be placed if it is to form a v v5omspw- g56r,cw2fc,3ni alirtual 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 le2tzmb , ;8zfqrns, such as is used in many 35-mm cameras, must an object be positioned if it is to form a real image matr 8fmz;b, 2zqgnified 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 with focalo fc/vsosrx* .t:vk4. length 20 cm, are placed in contact. What is the focal length of this comp*cvx4.:vokf. /ro st sound 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-col0(qbdzva 1n5to b ++5doio)unvex) thin lens has radii of curvature 46 cm, and is made of glass of index on d t+al55di+vb) uq1o0(bozof 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 = tx *x iwy:4(1dhbhg:vcruoo2o 89 m/j 1.50) has a radius of 40 cm on the front side and 30 cm ojrgo4w8ov2io* u( x:bhdh 1 t myx/c:9n the back 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 using a piece of plastic (n = 1.70). The radius of jks4r dw *r7j7;f kmks-pq;q-the front surface is 20 cm and the radius of the back surface is 30 ;4 frj7jd -pqsqwks*km;-kr7cm. 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 4) c b iaog7:4.ftnzdr30 cm. It is made of glass of index:r go73nzc)ift d. ba4 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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