Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, and theyctfm2h4 lr88 formation of images by mirrors and lenses has beey4hc8ml2f t8 rn successful 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 incidencvv9g 8l z4qxp*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 worwf5t a7i/v dj,k 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 image that isjyc:-rhub7 b.uf -h t.

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 produca*uaej w kulf1r4-fww( qafy/ o8w7;7e 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, 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 p 19o6 dfpb ;mx2y*grgzass through the image location, a6 rd1;p mg2zg *obyx9fnd 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 thro5pn k;j9+cndbuzgcnu p131 d2yfys.- ugh the image location, and could appear on paper or film placed at +k2 n3bcsj.ddyp-gcn1 9zp1f5uu;yn 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 virm5lukg;-cx z8 tual 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 tfegx. b4 c3q0zakes place on the outer surface of the sphericalqf0 bc.zgx4 3e 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 on which kw/mxj/exw-0 d(q-v j reflection takes place on the inner surface of the sphere isx wev(/0 j/wdkm --xqj 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, the3 qs pzdoxq5m5k2l:7r 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 co*r7a7ecsjh s 4ncave mirror's axis, strikes the mirror's surface near its midpoint. After reflection, this rra 77* j4sscheay

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 , jev e6d- o0dhfsr*3xpath 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 a52 6r6gpb xb6h2im bmzbgz88 r concave mirror's axis, crosses the axis at the mirror's center of curvature before striking the mirror's surface. zmp5 8mbz 2x bbbggrh 2666r8iAfter 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 lramzio-3vb o/0 evwb4o -.x5 a path through the center of curvature is reor4 .o-/v-aw eb0mv3bl xoz5 iflected

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, travelinwx8gnq+xk6q qa7ing+qx +0z: g obliquely to a concave mirror's surface, crosses the axis at the mirror's focal point before striking the mqkz+ 8n7gi0w xn a:qxg6 x+q+qirror'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 a path throu;p-1 yzrj x- p-b a;-rtemyw/xgh the focal point is reflectedrt;pyj r/-bx;-ep x -m-wz1 ay

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 th dt;sxf dop8g+e75ua. 6/ae kyree rays for finding the image position due to a curved mirrodas 8xu6de ek +yp /7gof5;.atr.

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 mirr.sd+*rl eqh x,or, 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 center of curvature. The image pcm)clo4m+ i0v3;o7l v f7zhoproducl 7m)i 0+fpc;374loo cvmhzvoed 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 c rms) .wzbmh58c.qap;j +argex8cu v. f7qt96 enter of curvature and its focal point. The 9x +vegwr8.azmbscj .p. qf)8q; t chm57ur6a image produced by the 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 surface and ijh 4fd.6u lp8hs 59cvyts focal point. The image formed in this case 8d.pc6h9 5 uyl4h vjfsis

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 v rc bve8*kn6epcp6)+ mirror, at the same distance from it as its radius of cur*)pcn68bpvk6vre e +cvature,

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 distanmg.8)og r+t *z: wvzfdce from it as its focal length+gzw .v*rfz8)om: dgt,

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 cur 61,tc7do kgj rlxmg+5ved 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 bottom (convex) side of a shiny spoon, what wixt,kmc6r1 o7 + ljgd5gll 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 pr c8df2 ufy:p34gtxbz0mj( d.toduce 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 whiivh ,0)sioua.ch

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 sphejgwja60jt.z /.ex+8i 7 :0 gcwvdvwperical 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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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single convex spherical mirror prodm v8c lu;:udeqq6q6e8uces 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 :bg)b3 vpd d d*8dx*tafor 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 o- jrp1sb76 nsimage 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 distance is negative, the ima9kycd) f r hjlxou-l+43u1ui 9ge 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 positive value, thed6mg6slgo olvu:0b8 d:j )8*h c tdpv9 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, mwksx + -iq9,wthe image 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 the3 k*7/ow /ke/sc4 p8b fpqglze image is k 3swk f7*po/pzee8/l4c/gqb

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, then tsvzvi)*k9 o fqetze:5 d7co(z 5; ic,phe image iskd7v, p 9i (ce; zsc)*o zote:5vzqfi5

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 q. 0 e0ej4:ucauvp s:ov:kb (zto 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 fastesya,98oth/ ) eaqc w4fny8a+oy t

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 substancezztbvp 2;y r/oq3f )osx8*v ;cs, the 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 a medium would imp6/xk oy*s0 q6caew:oy ly

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 diamoh*6 t7lc )draznd 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 incidenwt28wpgg1 u 121a hsf /l8plgkce

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 in6qy 6rv8(sj6swb,g:jbkci8 b2x iqt- to 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 refraction willjh;ok)3ps dr49o+l5i bd+ltrgnm3 n8 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 incidefuij;ei:y+m h1h*+ k5p. m0v hvtcw 3wnt 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 badp8 cg*-5cjde sed 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 f4w n:ljgx0ppd , vvr:7rom 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 wor3zdqtbujm x ,a4 2e6pzu2w 25 okq,zu+k 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 the o u vrep3qb;3( /r.lwpg0h ;hecenter 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 7ibjd(qjljnm *neu *4z :yv+9the 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 cenayaxq6k *m:a; vh8*ajter

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 diop j (qquszn)j;mbag*d 84 7xio3ters, whereas lens A is rated at 10 diopters. Thej4) x;nqbdz mu7qgjo8 a3(is* 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 thi0,w cw h:jsrxin:m:jll9mf 8;n concave lens, strikes the lens near its midpoint. After traveling though the lens, this nmj,fs:0 w:;l ihcm :8rjxlw9ray 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 3d +6w3q ejge/h3l kjslens, strikes the lje gl 33e36qjkwh+s/dens 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 threiw1e4 c8(qu uke rays for finding the image position due to a thin lensieqwu c 14uk(8.

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 s 2p6qvi4t azbq0k+n/mq8 7w klength $f$. 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 length8d5scymr 8.l ( pxze+r $f$. 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 r-ri8qpvo apy -2yc uc/3,; k tz7+fkffocal 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 leng-9z qn+ p:sw-pgmdla; b9ohz 1th $f$. 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 foc:e, h--a k g c1(cp0mx4sl)-gep tewxoal 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 lens and its focal point. T6 r8rpe3d tv3whe image formed is8trw3vp6dre3

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 lense 9lb+cyaif( 8t 4z 1x:mttnqi5s

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 see throughr+8qxk 0f key8f; f s ij2.b0t5sfqu)j 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 prm-dt d/ c)aq0 vq:g(b oj7-k9rjtju-laced a converging lens of focalj7(-qj-q rc )/ b v9atk0uogjdm:d-tr 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 lx . c61l6yn15cgbxhbl engths $f_1$ 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-cont:of px0p+ s8ovex) lenses are placed in contact. If each has a focal length of 20 cm, how would you expect the combina o8ptosp:+xf0 tion 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 withmk/m99.* dw+k2v bekbdw8 o)rf f1jam an angle of incidence of d brdm m182bkma9kfow9v/ *)jf. +kew$52^{\circ}$. 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 ofk2 vg2znlm. ww; x-e4 zxnmh0aq ,lg383xqc2g a plane mirror. The image formed by the mirror appear2xw lkzwx3e.,mm g cq-82xahq0lz;nn 32gg4vs 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 0.75nh. 4;u sxsov*gd(it4 m in front of a vertical pla x(osn* u4gi4dts; h.vne mirror?

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 wlgd-wveic33 7hen you approach a vertical plane mirror at a speed of 2 d3c e7giwlv- 3m/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 mirr)v iw amm;;n)1gcfo o)or has a radius of curvature of 20 cm. How far from the mirror is the focal poinc) mm) n1o fa)w;;ovgit 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 image 3w0xlf5dayh8sp a:,d:kwd1) k 0 cm from the mirror. What y0 :dsf, p 8wl5 k:daxdh)wka1is the object 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 front of a co68pvq edq1.e2j 2 zzclncave mirror, and the image is 3.0 cm in front of the mirror. What is the foca1 c6 2z2jdqqp.8vel ezl 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 conc48h9 z1(i8. lqcsyh8h(mvkkxk 0ileoave mirror with focal length 3 cm. Where is zhh(kk cky80loqismh4xv9e881. (i l 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 10 f34 czrx2*iidax3 ,ct4:kq m ycm in front of the mirror on the mirror's axis. 4cmyd 3t,23z:rikqfxci*a x 4 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 mirror has a focal length of 20 cm. An object is placed 3zn*s;sbl, vo 9cmo*u80 cm in front of the mirror on the mirror's axis. Where is thbn*s8u ocoszvl 9m,;*e 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.dyn4g.fwgw7 sd*ho 53 The image is 4.7 cm tall, and 10 cm from the mir*.dg4 g7h dfws3o5 ynwror. 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 foca2dtr9iq gadzw 94,hulqb3 c9d y +r,g0l length 20 cm. The object is 4.0 cm tall. How tall is the imag3gy+9d atl r9c qdgu ,42qbdzi,9w 0hre?

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 wr* gj,f67-x o; hfdvbtall, and 14.8 cm from the mirror. H*6d,jx rfo-v7fhw ;b gow far 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 from a concave mirj3wiv tq 7sfn0/6m33pzpvtpg:+h2e v ror. If the image is 4.0 cm tall, how far is it from the fetzp3qtpwvsp:3g vhv26 mj3n07/i + 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 of3 , p6g0hiklz2 ij)jsy focal length 20 cm. The object is 4.0 cm tall. Where is the 3jzyh i)ks,p62jg 0 liimage 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 miv3- hsu go*+lm;,*rcl;tojw irror), the erect image is twice the size of the object. What is the focal lh;-ucl3mg;jo lw *v,t +i*ro sength 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 shavingt 1 g( 1jjo+ orwbnzva5;z2d.z mirror. If the image is an erect image 1.5 times as large as the object, what is the mirror's focal lengtr1;t51 on zgbjw ojzvd+ za2.(h?

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 jt b2ce ccx, *g;u*n7nmirror with focal length 5.0 cm. Where is the object?jb2u,cgc n t7;c *enx*

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 is plp1qf zzs4: b4n .p/sqsaced 10 cm in front of the mirror on the mirror's a 4p1sqsbz /.4:f szpnqxis. 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 ozz5k- /;b sdu-20 cm. An object is placed 30 cm in front of the mirror on ts 5/-dbokuz;zhe 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 froo9oe7 /rzy1u.c2aaxw5*7q4ml*hkpjuljo0g nt of a convex mirror. The image is 5.8 cm behind the mirrorjomo 7qr ze4auw *xgj 19al .0k7lc*2p5youh/. 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 ixptgcbh(0 imm d2-5l3 mage is 7.80 cm tall, and 14.8 cm from a convex2( 0 -3ctbh5mlmgd xpi mirror. 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 index of refraction of 1. - c3rehggi/o+50, what is the speed of light through /i+ o-hr3cgg eit?

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 interface at an angl4 fzt:mv)o7arnk4 wf1e 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 b biy jk lfj:3859l2bwfrom 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 w:lv t8n46xg;-yk bdmsater. The incoming 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 cmd-j1kgybejhm1x( i v f f29d +(+pb(lk thick is spread smoothly and evenly over the surface of water on a windless day. What is the angle of refraction in the water 2(f(-dbyb+iex +gd9pl1fj1 h(v mkjkfor 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 water. At w odd 2ejh.d7.uv8cd6 shat angle must the diver shine a beam of light toward the surface in order for a person on a distant 8.dj h usddvod2 6c7e.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 trol0e;cm5e *k/e kvlulmmox e3jy;2wvd3+(e;ansparent material at an anell0luk3 +3j*eme m m5 v;d/eyox;v2e(k;wcogle 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 air is incident on 2*xgb q( /i ct1og:buga slab of transparent material. The incident beam and *g2 bigcb x1tg quo/(: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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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. Light is passing through it at oqv48v,r2c3hmk k6lkit w4te+g+)v ww2tcg+th4vkrm 3vo qwk,+)4lekv 68 i$53.0^{\circ}$. 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 a mwl/.qk swg r0q:ir1z3h79vsngle for light traveling from crown glass (n = 1.52) into water (n = gvq1rshksl 7:qzw /0 i3mr.w91.33)?

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. Wha yf8h3u- .mkvv 7tdk/ eyn.yy0t is its critical angle of incidet 3v7vyfuk/ y. knym-hy.8ed0nce?

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 with ind+rq2 +hvh,:a4h6-y3 q olh sps0truxiex of refraction of 1.50. For what angle of incido23,srihq r xhsay4+0h6l:p u+t-hvq ence will light 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 is measured at wfi/fe)kqw40 q-y 2 73ysmjhw$57.3^{\circ}$. 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 air uo04 hfg8 ;zq9at)io uat $30.0^{\circ}$ 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 mesar+ z2zmycboc2o6*h /t 5kc 5ter long and has a diameter of 20 mm. Its ends are perpendicular to its axis. Its index of re2bcc5y2o zm+zksa/ 5*ct6r o hfraction 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 frl ns0d804o9t bwm1 l/xn,nmnj :umt0 aont of a 20 cm focal length converging lens. How far is the image o,wdb9mantxmtm0 s1 l8: n0u ln0 jno4/f 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 converginy-3sipvqrrvu0hcl ,rxy.0f 9 s86 )ldg lens with focal length 4 cm. Where is6p ydrf c-,uiv ylq8s 0sxl). 0h9r3vr the 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 converging lens, and the image is 4.0 mm behinf:cwfg*bic1 4d the lens. What is the focal length of th fci g*:wf41bce 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 7(tooxjo4*h8c 5+cnv hz.sacmy c2w*mm from a converging lens. If the image is 4.0 mm tall, hvc8acn45w(sozo2h cct+x.y 7jo* mh *ow 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 imam k, v990d bby,onor9qge is half the size of the object. n,myqbr990o, dk bvo 9What 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 of a co+69 vk+ti*4azprcj pvnverging lens with focal length 5.0 mm. Where is the objecp+p* c6 az4vrvki j+9tt?

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. The image iapx0r.0 -gw ry;n rdlqum 3s)6ur8vh*s virtual and 6.2 cm tall. What is the focal lengn;u3 xyr-w6)mdrlpua r8h0 vsr.0qg* th 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 len:y npcw.61 nh 1e+okjbs. The image is 4.0 mm tall, and 9.0 cm from the lens. How tall is the.jn : owec6k1y+ 1bhpn 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 placed 60 cm from a converging lens, it forms a real image.o kqzi:b *od:rb /bhcfr :l28b9r7wh 6 When the object is moved to 40 cm from the lens, the i/lqb8rk7:rbh oo 9:*6hz2bci bdw f:rmage moves 10 cm farther from the lens. 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 lens5 scpv8-l pl(l. The lens has a focal ps5(v8cl -p lllength of 10 cm. What are the values, respectively, of 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 front ebe 1w x+ltk-0od /m-lof a diverging lens with a focal length of 10 cm. What1l/em0bke dl wot-x -+ 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 ofvi 33lef2/h we a diverging lens with a focal length of 10 cm. What is the l/2 feiw 3veh3magnification?

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 diverging lens. sf y 33ixrv3np +zwdkzi;s6q7ytz:/ /2 lg3da The image is 4.0 cm from the lens. xz3 q3i62ysdznpvg7 ifl3r;:/tw /kzsa d y 3+ How tall 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 is in front of a diverging lens(i+rmecn)y1jo:wv b0w)z3mp . The image is 2.5 cm tall, and 7.5 cm from the w ) mbzjpri vmo)0+( :ce3nwy1lens. 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 distance of 40 cm from a thin lens. If a virtu -6lc- kvin;zu)rh8c aal image forms at cu)vhnc6r-l 8-k;zai a 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 focak19zocv j- ludd4 qkwb7) lc+ /.tn9oyl length 50 mm must the object be placed if it is to form a virtual image magnified in size by a factor of thre.owt/kj-b1+)7kc d 9ynzlo u4 dc 9lvqe?

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;xjk91z q bha 8iw0 vvq,u4x1y 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 w a i890qv1,4v yk jzx1x;qhbusize 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, arp1 5 g8z-r,su cwm .po :j/wr 6otep1uhgya;.fe placed in contact. What is the focal length of this comp1pg-5u yr8f.ehwm1a:.rowjg /,pouct;6 ps zound 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) thin lens has radii of curvature 4h5id2x 9-;dwpx4ma pn0pu 7j n6 cm, and is made of glass of9 ahxu-5dx 4p;0mpd7nw2inp j 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 the front b7fu,1z6u ygq side and 30 cm on the back side. What is the focal length of the ley1uf,bqgu6 7z ns?

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 tv:c6um(h m8g(n = 1.70). The radius of the front surface is 20 cm and the radius of the back surface is 30 cm. Wha(ut: g6vh8mcm t 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 4,91j2 t; pkgrb 3bugjo0 cm. It is made of glass of index buj,3gp1bk9 tro2j ;gof 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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