Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, and the formation of imd2y.xb1wkd:v xck/hk6/ykv 1 ages by mirrors and lenses has been successful described by thex1bx62dw.kvk/kh d:ky1c yv /

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 y f4t8i 9m3vv.uphwv-

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 oh5zsvqi f1e px-/,fl dc.2f2 mirrors work 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 p0ktq/x (zg7:f2xx fdimage 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 images which : znleaa4qs*;

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 no( ihgx/wlz*v )t actually pass through the image location, and would ig()w v*l/ zxhnot 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 through the image locati nc/6*q vyz7:b6cvemw vb .ql)on, and could appear on paper or film placed at the that location isqy :b6 c cvn7ez)lqb. vvm*/w6 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 virtu q0;opa. e+f3ts/ fzmdal image?

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

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

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

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

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

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical mirror on which reflection takes place on the outer surface of the nb: .c wg9wj ig1r86pty8)ibx spherical shape is referred tw6n.8 ri pygibgbj8 9t:xc1) wo 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 whic7 iz rbwf-c,iq k/;dn0/j s5wlh reflection takes place on the inner surface of the sphere is referred to as 0,n;c zw lfr /iwj 5kbqis-7/da

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, tp: cm1(tvkf;bjs60 f4tx9v fx he focal length is

A. 2r

B. r

C. r/2

D. cannot be determined from the information given

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling parallel to a concave mirror's axi5iq+pgq a4q5 is, strikes the mirror's surface near its midpoint. After refqgp5i5qqa i+4lection, 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 p.9owv4lruh)st1(e q-m( k mw jath 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, travelipug4 9dsv0 20w; mtdylng obliquely to a concave mirror's axis, crosses the axis at the mirror's center of cu0y4 u;st 0dgl 2wpmv9drvature 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 through tqe* zjxt:s p5+he center of curvature is reflectedq:pjz+se5 x*t

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 3*w)vf sa3z5n nj/0ag c:m ofnui6hr9concave mirror's surface, crosses the axis at the mirror's focal point before striking the mirror's surface. Afterf sn ovm j563ann/:3hu9zgf0i * aw)cr 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 through the vnwrg ) /bf-2cfocal point is reflectedwr cnf)/b -g2v

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 pob7h-kw1mcv4fl 5 mg7hsition due to a curved mg17kh lm7fc5h bv4w-mirror.

该题自我估分: (必填) (满分:1.0分)

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a concave mirror, exactly at its focal po7m86vz 8 wja1 id 0zf1mdjhwq)int,

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. Ths0cndy e2* j;dbbhrq . ;oey66grz11te image produce s j .hbbo;206crye1dger dztq;61y*nd 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'w3frrmtv./.lws i*6a,x (rgoqeuy ); s center of curvature and its focal point. The image produced by the mirror is/i fl,6a3umwyxvg*q or.( r;r.e sw) t 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 its focal 0l5sub xn r-l lwo oyxm/)jc2 4sf2o2-point. The image formed y2fl -jrxx2 n-4w05o2lbo/m )uoslsc 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 5n::ew aqln ih:c/w ,tof a convex mirror, at the same distance from it as its radius of cur n ,icn:ah:lw tq:/ew5vature,

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 ;b nb9z/,ppg k;kaib2bt .n e8same distance from it as its foca 8z; kb;,nk9 bpin2.ebt/g abpl 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 9 obrx-)sb/ymp3 )(vv-fuca l-y*y vrsee a magnified image (a great big you) and sometimes you see a diminished image (a little you). If you look at the -csb)vr(v* by / -yo alyv9)rpxf-mu3bottom (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 mirrors produce lhhlg/+n4o5wimages 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 imagmw ,kgu, ee,4les 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 spho :dr;qls5/rolf 7y c,)oem3u erical 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 sphericazd/(ln daw d+9hwy*0z l mirror produces an image which is

A. always virtual.

B. always real.

C. real only if the object distance is less than

f

.

D. real only if the object distance is greater than

f

.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A negative magnificatip,om49k jj ye)on 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,1t2 ea sant lg285r:lljh1 1ab 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 distance is negatcgd m.xrwu6 0 xl m.klr2,+i.aive, 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 is ak)rx )ws:fx. o 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,y4 7gb,ru5ai q the 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 bia/s6p33i o 8q1c6sqazo 5gy of the magnification is larger than one, then the image is gp1os36zii6basc3o qay / 85q

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 smalyz) zn ;urp2en*q6uqd vw4, i,ler than one, then the image is,e z,v*i4 q w du;2qyun)6zprn

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 magnificpefotqbt8 :fy (s00: fation 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 fastest,8ej 7g2*dt/ yrnx:tmpe*satrz, m 5 j

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 4odfx a;o/iclrhu(9 c-w s34kindex 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 a(0drwfxog2 -i.5bo/- clc5ksui up 5than one for a medium would imply

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

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

C. refraction is not possible.

D. reflection is not possible.

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The index of refracth(b(+vt1v svrion of diamond 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 incidencu*: fep-x m 9packdnz b481w1we

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 dem+*x4 og wn8iqe-;vvpnser 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 wy*k hojpe25o2ox g*w3ill 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 traveling4mh+o, mzxf8s i. giv6 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 opti(tw+:xfs s. f)p w. 6owroj*kdcs 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 li rl:2c-nmki )/ . bp.),bxwo 2zjccjesght 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 lense65n 3dfiq+v,(twcnft; y nihxy1 1qm* s work is

A. refraction.

B. polarization.

C. dispersion.

D. total internal reflection.

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thickest at the centerhsgcz(/ 7f. uylpj)k: 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 uf9ik9xtk/ 0z 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 *um7 d5o hbk avfj54a(center

A. spread out light rays.

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

C. have no effect on light rays.

D. reflect light rays back.

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two diverging lenses are similar except that lens B is o+kq;z,slf4 1cf k,ka rated at 20 diopters, whereas len;zaqlkof kc1 k,+4,s fs A is rated 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 parallel to the axis of a thin concave lens, 9l o7mvtecxh 6 *lm4g)strikes the lens near its midpoint. After travm) *chx4l67gm9v ot leeling though the lens, this ray emerges traveling obliquely to the axis of the lens

A. such that it never crosses the axis.

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

C. passing between the lens and its focal point.

D. passing through the focal point.

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling parallel to the axis of a convex thin lens, strikes -qg 7lz kv((ebthe lens b((kgl ev-q z7near 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 three rays for finding the image position du 5z vb;tr;b;phe to a thin lensp;r5;;tb hz vb.

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 focalxx9 )+i09mz nqwv w4jl length

f

. An object is located at infinity. The image formed is located

A. at

2 f

.

B. between

f

and

2 f

.

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 length h( 9jdyy/bwua8 - x)tj

f

. An object is placed at

f

on the axis. The image formed is located

A. at infinity.

B. between

2 f

and infinity.

C. at

2 f

.

D. between

f

and

2 f

.

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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 o kml dspn806(length

f

. An object is placed at

f

on the axis. The image formed is located

A. at

2 f

.

B. between

f

and

2 f

.

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 le bu09-y dzjzj),xp-hyw9r r1j60cc ncngth

f

. An object is placed between

f

and

2 f

on the axis. The image formed is located

A. at

2 f

.

B. between

f

and

2 f

.

C. at

f

.

D. at a distance greater than

2 f

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 lk2s sh 7u)w.m nsharp831(b ym nmqj+0ength

f

. An object is placed between infinity and

2 f

from the lens on its axis. The image formed is located

A. at

2 f

.

B. between

f

and

2 f

.

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. Tav.765ld. lier x+xi dhe image formed i ad7xr+x.5 le.livd6is

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 conc/8*7qhx rxvjv (bvrrqsd96 (yave 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 y9rk hlx) z pshrwd ph;2n76 p(o)u1hk2ou 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 screh bimn ++gyr-:eome 3.en is placed a converging lens of focal length 24 cm. The filament of theo. -mgimr+b:h e+ nye3 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 lenfs /.dz k,b2.ubgf2c kgths

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-convgq jl23s(xpikxdkzrrn w 099cc6(5 k*ex) lenses are placed in contact. If each has a focal length of ld(cwsk9j3k6 9qir kcp*x2z50g (rn x20 cm, how would you expect the combination to function?

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

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

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

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

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diverging lens (

f = - 4.0 c m

) is positioned 2.0 cm to the left of a converging lens (

f = + 6.0 c m

). 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'xhswtu m:(/6qj)c4 p hs reflecting surface with an angle of incidence of ch6x4uj mt:)/w( qs ph

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 97 x ukxc tr 8hpm4bms4;v.orc 3n2zv-mirror. The image formed by the mirr4r c2 ushvx;3mp9tzrobk nxv-8.7c4m or 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 yo ke occ.1g;j6xgl97y qu stand 0.75 m in front of a vertical pla.q7g;ek g 1cl 9yocjx6ne 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 whej10e dpcfj +zgi 29rx+n you approach a vertical plane mirror at a speed ofj 90+fp1dig+x cz 2rej 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 radius of curvature or+p .ui8)p cbecrr9ym*5e2zs z1 /u ebf 20 cm. How far from the mir ucuri8* e)bzyp+5 sm2z.e/ e91cp rrbror is the focal point located?

A.

10 c m

B.

20 c m

C.

30 c m

D.

40 c m

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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 i* gh0w4;fcmz(,n0wo c v(tjb jmage 30 cm from the mirror. What is *f0wjzb,0jmog n ctw;c h4( (vthe object distance?

A.

20 c m

B.

15 c m

C.

7.5 c m

D.

5.0 c m

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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 imag -9+ bd:j j neudb:x7czlm2bfd;y;3a;zk gg 4ge is 3.0 cm in front bkj jc: 7f 9m;;nblu+yg3gdabd e2x d;:-gzz4 of the mirror. What is the focal length of the mirror?

A.

15 c m

B.

4.0 c m

C.

2.4 c m

D.

1.3 c m

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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 1 enqykg+p-1,qp+ pq bconcave mirror with focal length 3 cm. Where is thp+ +k-yn1pe,qgb1pqq e 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 ob htns4;pg ov5h4 (nc8aject is placed 10 cm in front of the mirror n5v;(484h tangchospon 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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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 l-i x gfq*9oa/lnp/w mvp j376cm. An object is placed 30 cm in front of the -lxwi/aog*6qm 9n 73fp/vl pj mirror on 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 5x 4sny)ka5qrr4w7r jqw8k b1. The image is 4.7 cm tall, and 10 cm from the mirror. How tall iq17wx5rab84rsy knwkq r4 )5js the object?

A.

12 c m

B.

11 c m

C.

8.2 c m

D.

2.7 c m

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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 f0nh v ,g9x9ye p3z.qdmirror of focal length 20 cm. The object is 4.0 cm tall. How tall is the ivpzf,.g h3y9xdn qe 90mage?

A.

1.0 c m

B.

2.0 c m

C.

8.0 c m

D.

16 c m

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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. Th)t(4 nv uatk0ze image is 38.6 cm tall, and 14.8 cm from the mirror. How fntkut4 0)az( var is the object from the mirror?

A.

124 c m

B.

47.6 c m

C.

18.2 c m

D.

12.0 c m

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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 frt4l9xbcknuq(l 2w:i r;c/g mc3vv;(com a concave mirror. If the image is 4.0 cm tall, how fag( 9q 4w nirb/ck; cc umx2vlc3:;(lvtr is it from the mirror?

A.

11 c m

B.

9.4 c m

C.

1.4 c m

D.

0.090 c m

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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 length 2fony(j30un: pp w2 48g(m4 zdagzlkx)0 cm. The object is 4.0 cm tall. Where is the ip8jufz2( dn:zp3 g4 4wn g0)yxaklm( omage 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 standsrnw5rp -hl u2x;ht1 k/ 40 cm in front of a cosmetic mirror (concave mirror), the erect image is rwuplk5t2h; nh1/r- xtwice the size of the object. What is the focal length of the mirror?

A.

27 c m

B.

40 c m

C.

80 c m

D.

160 c m

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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 mirror. If the i;b(:(kt2igs vk4i 9x aal0 eyymage is an erect image 1.5 times as large as the object,29a;b4 ikl0 ti(kvyasyg:x (e what is the mirror's focal length?

A.

20 c m

B.

50 c m

C.

70 c m

D.

90 c m

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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 mirrryl(n; 2xb r2sor with focal length 5.0 cm. Where is the o2sry( r nl2;xbbject?

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 placed 101xsn o3 bcy(f:9y,snd c3cnd o ny,sy:sx91bf( m in 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 focal length of -20 cm. An object is plac 5ybk0, ya9nnzmy/pk g5.f/mxed 30 cm in front of the mirror kgmbym/y,.y 0kxa zn5n/ f9p5 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. The image is 5t5nog*u9k6 r r.8 cm behind the mirror. W uo 6g5r9rk*nthat is the focal length of the mirror?

A. -4.1 cm

B. -8.2 cm

C. -9.9 cm

D. -20 cm

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 8.90 cm tall. The image is 7.80 cm tall,17 mh 7n9csa6bx.bo zq and 14.8 cm from a convex mirror. What is the mb71oh9amcb n.x s6 qz7irror'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 refrl*0 fssj+ h8 kjs2d4zl 3c*akyaction of 1.50, what is the speed of light througs2 skc4s80jl 3+ *ajhyzd flk*h it?

A.

2.00 \times 10^{8} m / s

B.

3.00 \times 10^{8} m / s

C.

4.50 \times 10^{8} m / s

D.

6.00 \times 10^{8} m / s

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray in air is incident on an air to glass interface at an angle 0z/u8kbvngk7, a,w sfof

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 substai9 jk*3z4 ek4 ,vspkjb2vnkl l f,:qn/nce 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 wat2uqwunc9po lqz)r6 59er. 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 cm thick is spread smoothly c;r*bh)(ju5o2 gtz ve and evenly over the surface of water on a windless day. What is the angle of refraction irhuv2(c gjz ;*et 5b)on 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 o2k 4s (;x-9adnvzu bzbf water. 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? sub;xkz4 (9 2n z-vdba(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, strikev 90ivexon+n j mo50e-s a plate of transparent material at an angle of incidno i0 -evv0+xej59omnence 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 inciden5k w ntuav8ad48y6e vzr: t9j*z1p3ant on a slab of transparent material. The incident beam and the revtud vrz88 1 eak6:zy*nw 34a9tajpn5fracted 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 passisveeq/. s31 6 us vzao/w:xd-ang through it at e3s1z o s/.6v sa:d aqw-xv/eu

{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 glass (n = 1.vv 52bxwfm h(1ru; 8gg52) into wa8x(bvw gg51m;hv u2fr ter (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 ofkrsq; c5pqi7+ 1.50. What is its critical angle of incidence?5iq+7 ;cpqsr k

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 withnq046(( n bvqp-fkdb*y5epf a (oiz1 x index of refraction of 1.50. For what *kop -y fe5f 4(zdq1qnnxb06iav( b(p angle of incidence 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 meashgp-wz id+ s7*ured 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 fca jcim86q )5from 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 meter l7i+yu+zd8yvh:mef7 zong and has a diameter of 20 mm. Its ends are perpendicular to its axis. Its index of refraction is 1.30. What is the maximum number of reflections a light ray entering one end will umy+eh+zfi :78v7 zy dmake 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 q :czp5y4 b-d 2ppgi:-0nedrx 20 cm focal length converging lens. How far is the image of this object from the r54bq:-gie2xcpdp-zd0 y n :p lens?

A.

40 c m

B.

20 c m

C.

13 c m

D. none of the given answers

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106#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 12 cm in front of a converging lens with fy/2a3dj y7fn focal length 4 cm. Where is dj/2fa yfy37nthe 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 ;-zy3-avev 6wpy2t3ko*v/z g:qa b r ulens, and the image is 4.0 mm behind the lens. What is the focal length u3yqz* k:pb-;3ea tvw6/-r z2ygvoav of the lens?

A.

11 m m

B.

5.5 m m

C.

3.8 m m

D.

3.2 m m

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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 4ac 6x:n:mkv-9 89ybs0ngcunh.0 mm from a converging lens. If the image is 4.0 mm tall, how far is it from the l8:cv96mxb nac0: 9 gynsu-nhkens?

A.

14 m m

B.

8.7 m m

C.

1.4 m m

D.

1.1 m m

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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 le.dw.r)svyjl- ns the inverted image is half the size o-)v drj. lyw.sf the object. What is the focal length of this lens?

A.

13 c m

B.

20 c m

C.

40 c m

D.

53 c m

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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 converging l3 4w(dws xnh5uens with focal length 5.0 mm. Where is the o4nw( w5su3hdxbject?

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 cgkv/wa u0vk 40m from a converging lens. The image is virtual and 6.2 cm tall. What is the focal lengtkv4k w0/uga0 vh of the lens?

A.

6.8 c m

B.

10 c m

C.

16 c m

D.

30 c m

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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 image is 4.0 mm tall, am oc+ wllga/v:c; 1 psvx:7z4jnd 9.0 cm from the lens. How tall is the 1v7: /;wsz 4lcjxlc + a:mgvopobject?

A.

6.8 m m

B.

5.4 m m

C.

1.7 m m

D.

0.68 m m

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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 cu :nux2 n+3bbqonverging lens, it forms a real image. When the object is moved to 40 cm from the lens, the image 2bu bn qn:u+3xmoves 10 cm farther from the lens. What is the focal length of the lens?

A.

20 c m

B.

30 c m

C.

40 c m

D.

42 c m

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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 len4 l+svlm4 onx6s has a focal length of 10 cm. What are the values, respectivel4 6vm4lnsxlo+y, 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 of a diverging lj8w8 h mv 1f 58ooqbsd++khy7aens with a focal length of 10 cm. What is the image distanmfv1qj +yobhs 85wa8+87 k hdoce?

A.

7.5 c m

B.

- 7.5 c m

C.

15 c m

D.

- 15 c m

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116#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at 30 cm in front of a diverging lens with 7 ,qxkr4f esuz n)vk(/snj7d )a focal length of 10 cm. n r(,s4ue7j)vfx/qsk k )n7zdWhat 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 4.8yrrqmi6f 8,cj cnx8mu) *t/+ayml2fd1 m z7h; cm in front of a diverging lens. The image is 4.0 cm from th6) m8 ,r n c fm+;/qlmya2xj czumhy1fdri*t87e lens. How tall is the image?

A.

13 c m

B.

8.7 c m

C.

5.4 c m

D.

1.8 c m

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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 tan,j fj0 9(mpman.t r7nll, and is in front of a diverging lens. The image is 2.5 cm tall, and 7.5 cm from the lens. What f ,j(t.mn0 rnj p79namis 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 d3,pmug3eygj4glmf5; 5xqx ;z istance of 40 cm from a thin lens. If a virtual image forms at a distance of j p,4g3gx xml3ym 5fz;5;gu qe50 cm from the lens, on the same side as the object, what is the focal length of the lens?

A.

45 c m

B.

75 c m

C.

90 c m

D.

200 c m

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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 focal8r0 rpyt xq,+a length 50 mm must the object be placed if it is to form a virtual image maa0+qt8yx,rp rgnified in size by a factor of three?

A.

33 m m

B.

42 m m

C.

48 m m

D.

54 m m

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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 les4ox6tr84oj pngth 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 size by a factor of8j6o xo pr4s4t three?

A.

46 m m

B.

52 m m

C.

58 m m

D.

67 m m

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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 focapp6jo+oyl uh k(4:r3el length 20 cm, are placed in contact. What is the focal lengte6pj3pkl oy(4h+o: ur h of this compound lens?

A.

40 c m

B.

20 c m

C.

15 c m

D.

10 c m

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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 h b qyxc39e1;qlas radii of curvature 46 cm, and is made of glass of index of refraction n = 1.60. What is th1y;elb3x9 qq ce focal length?

A. infinite

B.

38 c m

C.

30 c m

D.

18 c m

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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 madu,kv (ch, lua(e of glass (n = 1.50) has a radius of 40 cm on the front side and 30 cm on the back side. What is the focal length of the lens?(kul,( a,uchv

A.

11 c m

B.

34 c m

C.

80 c m

D.

240 c m

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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 piec 0k*jdib0li; oe 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 li;0l 0bjkdi o*ength of the lens?

A.

17 c m

B.

86 c m

C.

- 86 c m

D.

- 17 c m

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126#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plano-convex lens is to have a focal length of 40 cm. It 2ch lhghe-tlocn:5f8 9qch *6 +w6ix gis made of glass of index of 9he6hti 25g*c: fh-o nhx wlg8l c+q6crefraction
1.65. What radius of curvature is required?

A.

13 c m

B.

26 c m

C.

32 c m

D.

36 c m

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