Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, egs1x;:. gslrand the formation of images by mirrors and lenses has been sss:. lg;g exr1uccessful 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 incidencep2ih0d 8 rs + k3vidu8wbq;e6o

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 wbt c:+ykzua3d6 6kg)ljh) ,yn ork 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 .lu9x-dwz .6qnhso9 tan image that is

A. real and upright.

B. virtual and upright.

C. real and upside down.

D. virtual and upside down.

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Plane mirrors produc.a+lsz cu*+(ohhn/ ebe 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 pass th,k b)ud; ysxa.rough the image location, and would not appear on paper or film placed at b),ka. xs;yd uthat 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 ragp:9mn i2(zn,rg.3qgj /tjhab*g rq 7ys pass through the image location, and could appear on paper or film placed at the that location is referred to as m 7q2/a zhjtg3q,(j9bggpg .r:i*rnn

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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 imagetwru:n(fkph i :),x5m?

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 onw3z htj:sn4p yw-jpp f535 h;b which reflection takes place on the outer surface of the sphericaphwp;sjzf:p4j -n33w y 5bht5l 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 onu;(u80r/e mkg3 fcjd d which reflection takes place on the inner surface of the sphere is referred to as a/(3gkuum fc0d;8 e djr

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,k;zf 7unqe (6h the focal length is

A. 2r

B. r

C. r/2

D. cannot be determined from the information given

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling parallel to a concave mirror's axis, strikes the mmvtr /fn -wsr2d4p, p(irror's surfap,- (d4 fvsrwpt/rm2n ce near its midpoint. After reflection, this ray

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

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

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

D. passes through the mirror's focal point.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mirror on a path parallel to the axq rf dl d2lw/p8+lw3yjdv)k79is 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 obli(9z ff qj.)pbbquely to a concave mirror's axis, crosses the axis at the mirror's center of curvature before striking the mirror's surface. After reflection, this r qb.9)pf zjb(fay

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 mirroxwo6 51kq h;x o wqxp)ux5zk9:r on a path through the center of curvature is reflectewhoq5o : 6k)p q;9u1 w5xxxkzxd

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 concave mp2g. ; f/fw 7y;7 hse yobbx;9xgxq1wgirror's surface, crosses the axis at the mirror's focal point before striking the mirror's surface. After reflection, pxy ;7esf1f2w xg.qh b9;b7 ;gxgo/ wythis 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 fochq ey* .jrpc8.al point is reflectedchry .*.q j8pe

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 cu;cqu:bv,l/h q m+nw 2vrved m;,uwl2/mv +h qbc n:vqirror.

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 poi wl -eh0hfwo,*j08tsf nt,

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 czu p *.ilk p avc qtvr),3jif,3eik;m*cg1/y/enter of curvature. The image produced by the mirror is locatedc./kr yte/ , )iflm1*v3g3cza*vpj pi, iuk;q

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 cen5p/ p c:wt2dl(zvhje 2ter of curvature and its focald :clwpt /h(z5v pe22j point. The 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 s2 psms ai9(oh,-(g lpkurface and its focal point. The image formedol, sa((h m2- i9kpspg in this case is

A. real and inverted.

B. real and erect.

C. virtual and erect.

D. virtual and inverted.

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a convex mirror, at the same distance from it as it+;dsjrqaoza/ 0 xtu2q4v/ 2kt mw2jy4 s radius of cu/ktvq+j/2 m2z;4 4asjyu trw02dxaoq rvature,

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 ajkz 8tyy-eq ne-1bdp hyi5w2+.be,d6 convex mirror, at the same distance from it as its focal lend2 -kiybdewt j1h z85q+ep- .y ,eb6yngth,

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 magn zt1d6qx*rclx-x 6uh 4dfda3 /ified image (a great big you) and sometimes you see a diminished image (a little you). If you look at the bottom t*l6 hc6dq-rxdfa z4ud1x x3 /(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 pr8fbitv8z;we 1oduce 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 whiv +4;uel2jg hm2s( . hbfw/jt3iwv. hvch

A. are always smaller than the actual object.

B. are always larger than the actual object.

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

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

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single concave spherical mirror produces an imau3coj-, xz1u x c0p ,ii(9omfyge 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; :d13m(c9xeve *nhizvs: asyhich 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 o );/ tp+xe,d5arnevea 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 7+)m8oi 1irltigvy+gi ; ne0zis positive, 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 distanc9e6qo 3 0jqleoe 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 is a)xb7jloxy09k:u(9 r5 fdzsg l 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 negativev n ren1c52g ,nzljt/- value, 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 of the magnification is larger ou 5gjiw3 .5j2 0yoeusthan one, then the image is5o w.uegus0 2y5i3 jjo

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 smaller6rif mg7 j jewe37e:l8 than one, then the image isg7imj 7 fl3w:86eerej

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 equalgd + dis36x*rt 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)4 k6sver tvp;b9o) j(r jwyf2

A. in a vacuum.

B. through water.

C. through glass.

D. through diamond.

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

For all transparent material substances, the index oqz wah05/r: yw 1:i0/pqprkcwf 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 i mk/9:bru ug0w c71azr:,ei8gn , ekbsmply

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 refractio0+2i0 lg 3xe,; n cctgkixk0htn 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 incidenc q(c-9c0shobm e

A. must equal the angle of refraction.

B. is always less than the angle of refraction.

C. is always greater than the angle of refraction.

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

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light traveling at an angle into a denser medium iss)us2 : .e+z:-hu8rzt nnvfra 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 will c0z lgn3. p:2xqn) mo)gw .-7lrpwgnw 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 odb7 y rv: i(f4cuepau+ ;0sl0mn 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 based vde(2h)/se / nikw 3ksis

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 fqf,k;g8ykz( 0v7 zw)qyi 041d pea qvxor a beam of light passing from water into air is $48.8^{\circ}$. This means that all light rays with an angle of incidence greater than this angle will be

A. absorbed.

B. totally reflected.

C. partially reflected and partially transmitted.

D. totally transmitted.

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on whichzd8-khpv/ g 40uxkb4 fp6gwk qf;,b4l lenses 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 ceo r-ruh1rsr.;nter 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 thci(z.h ci m vx:/d5hz9e 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 b )syl rxrp).s: +/5g5tmbikhcenter

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 s,twpo:iw8a u8f7wc3 z imilar except that lens B is rated at 20 diopters, whereas lens A is rated at 10 diopters. The focal length of lens B c7a8 o witw zp8,u:3fwis

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 parale l y8).d+mmldhg rg u(7x0;mwlel to the axis of a thin concave lens, strikes the lens near its midpoint. After traveling though the lens, this ray emerl7g dhw8 e;(+mdgmur)l.mx0y ges 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 thd ;3/l1bmd: (hcu/* y5 jtha rfhm7kxpe lens near its midpoint. After traveling through the lens, this ray emerdm a5d h7;m:3h*rly (/bhtc x/p1kfujges 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+6cog +2ffa ga 7pk;ff.ugm yh 6te:0g finding the image position due to a thin le gof7tg.u6m :a y6f0ck+ 2g;ahf+pfge ns.

该题自我估分: (必填) (满分:1.0分)

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has foca .gpw(pg t,lyj0+m2szl length $f$. 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 za:+(o8mw s)eexw (fafocal length $f$. 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 fo4b.cnz,o(1q 8 0g g;pzhltsgw cal length $f$. An object is placed at $f$ on the axis. The image formed is located

A. at $2f$.

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

C. at $f$.

D. between the lens and $f$.

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a focal lep ehe3su5 vp6r-r28x ingth $f$. An object is placed between $f$ and $2f$ on the axis. The image formed is located

A. at $2f$.

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

C. at $f$.

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

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a focal lengc;q)o0kpk3gjgfmui m0rk hb9: kt lvs x *70.8th $f$. 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. The image formdq1k3j e(tim; ed mj 3k(tqde;i1 is

A. virtual and erect.

B. virtual and inverted.

C. real and erect.

D. real and inverted.

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The images formed by con gp.pv(:xriut )6 1fr3(i3 rfyhpqpn2cave 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 you see through a magnifying gri jb6/.a+,a dmu-aj qlass 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. Beqiis y3o31lvj-t*1 l ;kfs -svr:i8fa tween the lamp and the screen is placed a converging lens of focal length 24 cm. The filament of the lamp can be imaged on the screen.8kf sfv1r -vqyi3lssi:it1oj;-l*3a 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 lend /ugx9 zm.5hwgths $f_1$ 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 (conv2sno; mi(5uhm*7raifex-convex) lenses are placed in contact. If each has a focal 7( *5hr2of;m musinailength of 20 cm, how would you expect the combination to function?

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

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

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

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

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. converge.

B. diverge.

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

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

E. will travel back toward the light source.

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A laser beam strikes a plane's reflecting surface with an ankltk8rdg q8 qr4c.et68iwt 5 ;0ba7edgle of incidence of rlw 6b40i ck8rt8ed5kteqg qa;t7 .d8$52^{\circ}$. 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 frosg90pro4z6s4h jdb,uco )3 ldnt of a plane mirror. The image formed by the mirror appears to b,cl ubh3 osd6jdpo4)g rz904se

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 t)x5l3qxxa *3r yz3roimage when you stand 0.75 m in front of a vertical plane mirr53lrtqx3 xa*y3zrox)or?

A. $0.75 \; m$

B. $1.5 \; m$

C. $3.0 \; m$

D. none of the given answers

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How fast do you approach your image when you approach auuw4z2otb+c9cdo(k94 5tv gh; c yy*d vertical plane mirror at a speed of 2 mt( cudgk4 wto24ucy;v*c obdh9 9yz+5/s?

A. 1 m/s

B. 2 m/s

C. 4 m/s

D. none of the given answers

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical concave mirror has a radius of curvature of 20 cm.,ayj p t*ue91z How far from the mirror is the focal poj, *y 91zatupeint 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 30 cm from wfc2h6 qy. yboj86 l,ythe mirror. What is thyc2b ol h8f,.6yqjyw6e 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 concave mirror, and the image is 3.0 cm in fron: ndvxc3 :,ro h-);sfnvat*aut of the mirror. What is the focal length ofau,)n vr -cnx;h3fv*a so ::dt the mirror?

A. $15 \; cm$

B. $4.0 \; cm$

C. $2.4 \; cm$

D. $1.3 \; cm$

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 10 cm in front of a concave mirror with focal length wc1ozcg(89 bs 3 cm. Where is9z1cswb( g oc8 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 mirrorr; .z pdr do2;: v*r3verxf1qc has a focal length of 20 cm. An object is placed 10 cm in front of the mirror on the mirror's axis. Where xrvzq:2e; r3df *dv.r 1opcr;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 purxxxzj (8bf.0vms24 xno )+g3t + vwej+y0ilength of 20 cm. An object is placed 30 cm in front of the mirror on tx.p2 0rvuxje tn8 oi)b3mxg+(xy+ v+ szfj40w he 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 talm7jdch+rb(zhlr 7 z/o *q7 )bbl, and 10 cm from the +j()77/zormdb7 br l hb c*hzqmirror. How tall is the object?

A. $12 \; cm$

B. $11 \; cm$

C. $8.2 \; cm$

D. $2.7 \; cm$

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 15 cm from a concave mirror of focal length 20 cm. The (**06rcark cznwhn w9ge;6oyobject is 4.0 cm tall. How tall inrcge6w6anrh*; 0kwc *oz 9y(s 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 rw:swl t50g;0q)mjgwa; fg:pbz4xf4.8 cm from the mirror. How far is the object from the ma wz;4 w s;mffgglwbgpqjxtr 0:): 450irror?

A. $124 \; cm$

B. $47.6 \; cm$

C. $18.2 \; cm$

D. $12.0 \; cm$

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.4 cm tall object is 4.0 cm from a concave mirror. If the image is 4.0 cumm54q 3i 0rc)+jfosy m tall, how far is itc j)ium of0s5yq3rm+4 from the mirror?

A. $11 \; cm$

B. $9.4 \; cm$

C. $1.4 \; cm$

D. $0.090 \; cm$

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 15 cm from a concave mirror of focal length cu1zgb(:-kpmr, b(1dd avoq820 cm. The object is 4.0 cm tall. Where is the image locazbd1g -krpuvod, 1(q:m ( 8bcated?

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 mir3*4kgihspb zs,da6oq2fw46 k ror), the erect image is twice the size of the object. What is the focal length of the os 4a3k6g64,k dqp2ihfzb s w*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 fros1z8p w 6v91iv6cihbvnt of a concave shaving mirror. If the image is an erect image 1.5 times as large as the object, what is the mirror's fo pv1iv8i zw1c9s66vbh cal length?

A. $20 \; cm$

B. $50 \; cm$

C. $70 \; cm$

D. $90 \; cm$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image is 4.0 cm behind a concave mirror with fo( cjlvwu8:9 2dhe-h5.1(y sreh zo6nfuzlx*ocal length 5.0 cm. Where is the objue-x1l l*2w vz:rso hhcoje(9z.n658 fduyh( ect?

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 offh3/ bk9 5f3 zfh6:cg ,h1w,uztlclu l -20 cm. An object is placed 10 cm in front of the mirror on the mirror's axis. W3btfz:fg5cll3hu c h 6 khz,/uwf 1l9,here 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 leno hnjmw4k-+b*gth of -20 cm. An object is placed 30 cm in front of the mirror on*-ohm4jw +kb n 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 5.8 cm be .2ij/k/q*p+dtzism2xszgu1hind the mirror. W 12//tupizq2i .gd*kxs m zjs+hat 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. Thy9-hq3x4mssddo*- /:i mxh 4m yhm)z ue image is 7.80 cm tall, and 14.8 cm from a convex mirromy:x94/msdmy zs43xo ih--*dh mu )h qr. 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 1.50, what is the2 :d 21ny-q ac+znrn (autfo-r speed of light through it?+nrt-1-2a(aqc2 nrod yf:n uz

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 interfa g*m(f be(j9zqce at an angle of $45^{\circ}$ and is refracted at an angle of $30^{\circ}$ to the normal. What is the index of refraction of the glass?

A. 1.23

B. 1.31

C. 1.41

D. 1.74

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters a substance freqpt9,fi22 y+c4 i4op, nwd jnom 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 watiek ife7yo1macp1jz5cdy5l i9 n+aq-)- , d-ter. 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 zx tfvap/49,)a xy0nx 5.0 cm thick is spread smoothly and evenly over the surface of water on a windless day. What is the angle of refraction in txz/at px,9v4) nafy0 xhe 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 yp:f o;5:;cb9gfgrt n still pond of 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? (The index of refraction for:fgt;r ygpbo;5c n:9f 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, travs7m fdycf4uvgtg4+y b( qst, o+)mp43eling in air, strikes a plate of transparent material at an angle f b3 sdgo+y+4y m( ,p4tqcgv s7)utm4fof 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 ofzzshjms:8/j b v ;uf60 w:p(bs transparent material. The incident beam and the refracted beam make angles oz:s0(s6fp j/svb w; uhj: b8zmf $40^{\circ}$ 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 inibvb 5;z-+x.eesmze6(j 0 jg edex of refraction of 1.46. Light is passing through it at 5egvjze(ebs6mz i-x0b; e j.+$53.0^{\circ}$. 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 = 1.5ooob 6et h+)r8:qzhu : (kz9za2) into water (n =h b o(+zqez:ot 8oauhzk: )69r 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 ijcu/vd)a)afgg9- b8 ws its critical angle of incidencvdjcf8/a9a) u)- gwgbe?

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 ofb*kkti8w -ko1ap 5deehn d+7xk nm)(x/i5 es9 clear plastic with index of refraction of 1.50. For what angle of incidence will light rem- xbe8xkh+9 min* a)t kp dnsw5eo75e(1/kikdain 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 p4ixq,ledpjbz l2i 0k;w j 0, p4)zqa3measured 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 fromlbye9uzexe.)1n . - tb 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 long and has a diamt.p wmkmf9636 snybqv 9c79r zte1;kzeter of 20 mm. Its ends are perpendicular to its axis. Itsz zmb 7;tkek69cr 3tw1qpy m 6fs.n9v9 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 40 cm in front of a 20 cm focal length0 z:+ uup6 hvx9rcus;k converging lens. How far is tu zvpr60xc9: uu;+sh khe image of this object from the lens?

A. $40 \; cm$

B. $20 \; cm$

C. $13 \; cm$

D. none of the given answers

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106#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 12 cm in front of a converging lens wia9mkvu:4c xlt 9r /q*nth focal length 4 cm. Where is the imagmcraxt 4*u9qn/9 k: vle?

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 0 mp43b+.9wohojvoz;t tv /oe8q 4 ;bdcov0ft mm behind the lens. What is the focal lencdovvh4 0bto. 8b9 p0zjo4wvo +f;t /;3t eqomgth 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 the +,3i amxej+ma 5idyk2w c gqrh:* w,s8image is 4.0 mm tall, how far is it from th3 8, megic m sj,a a*xwdk2w++qr:5ihye 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 frrndf jv- a7p(o;ijb88 ont of a converging lens the inverted image is half the size of the object. What is the focal length of this lj;avob 8 dn(-ipj87 frens?

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 converging lens with focal length 5.0 mm. Wheb-g l95 mj9ok+e6 w:kyfhsn-tre ish ky -tg n6+b9- klse:wjofm95 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. The image5 +jyg3 o tain/o*d: +jb/d0iq/btitd is virtual and 6.2 cm tall. What is the focal length ofd30d i*ioao +ntbt jd+5/ :biyqj/t/g 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. Tha:b tr 89,kt ,rkqep7dy7h7cn c+az4wr.iki*e image is 4.0 mm tall, and 9.0 cm from the lenn qt7:rca77hk* w9i,kecyrtba,8rd+.4 p kizs. How tall is the object?

A. $6.8 \; mm$

B. $5.4 \; mm$

C. $1.7 \; mm$

D. $0.68 \; mm$

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113#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When an object is placed 60 cm from a converging lens, it foo47u m y32l/oniqcqr /rms a real image. When the object is moved to 40 cm from the lens, the image moves 10 cm farther from the lens. What is the focal length of the lensni3mqqy/ 2/clro47u o?

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 distapn2y/qz:oh0 v4 mne;bnce of 30 cm from a thin convex lens. The lens has a focal length of 10 cm. What arphnynq/ o2em 0;z4bv:e 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 geo09ei1: r;,t pekgofront of a diverging lens with a focal length of 10 cm. What is tg pet9oo1: rg;kie0e,he image distance?

A. $7.5 \; cm$

B. $-7.5 \; cm$

C. $15 \; cm$

D. $-15 \; cm$

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116#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at 30 cm in front of a diverging lens with a focasbq75(hqlmdw8f n . w.,kvgb(l length of 10 cm. Whdbq n87kmsb f ,5w (wl.vhgq(.at is the magnification?

A. 0.25

B. -0.25

C. 0.67

D. -0.67

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117#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 10.4 cm tall, and 4.8 cm in front of a diverr c8 vtkuya:((ging lens. The image is 4.0 cm from the lens. How tall 8tr( uvckya(: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 qd3,.zrz:1b+u zygun lens. The image is 2.5 cm tall, and 7.5 cm from the lens. What is,gd. uzry nzqbz:3+1u 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(z1e u0s:atjbzp t*p) thin lens. If a virtual image forms at a di ue *attb(1)s0zp pz:jstance of 50 cm from the lens, on the same side as the object, what is the focal length of the lens?

A. $45 \; cm$

B. $75 \; cm$

C. $90 \; cm$

D. $200 \; cm$

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120#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far from a lens of focal length 50 mm must the objec.tqfk-91.upb3vkx z ubjg ( 4ct be placed if it is to form a.g f (p z1j3bxu.v4qk9-uctkb virtual 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 lens, such as is used * k 3ko6(gvvtk *xx-sr: urpl6ghma9;in many 35-mm cameras, must an obv6 xs :k*luko g-rt3rx;m6vhka*p(g 9ject be positioned if it is to form a real image magnified in size by a factor of three?

A. $46 \; mm$

B. $52 \; mm$

C. $58 \; mm$

D. $67 \; mm$

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122#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two very thin lenses, each with focal length,sv4/dds sv8y 20 cm, are placed in contact. What is tsvdd,/4v sy s8he focal length of this compound lens?

A. $40 \; cm$

B. $20 \; cm$

C. $15 \; cm$

D. $10 \; cm$

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123#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A double convex (convex-convex) thin lens has radii of curvature 46 cm, and is m ms,en qnkj3/oy,t;x(j,kn/nmyxs,; (e 3 otqade of glass of index of refraction n = 1.60. What is the focal length?

A. infinite

B. $38 \; cm$

C. $30 \; cm$

D. $18 \; cm$

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124#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A double convex lens made of glass (n =x ys,z lm. w3jq;bhz2+ 1.50) has a radius of 40 cm on the front side and 30 cm on the back side. What 3, q.+ hl zxm2b;wjzysis 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 pl 2gvjqs;a vu58astic (n = 1.70). The radius of the front surface is 20 cm and the radius o25 q g8vasujv;f the back surface is 30 cm. What is the focal length of the lens?

A. $17 \; cm$

B. $86 \; cm$

C. $-86 \; cm$

D. $-17 \; cm$

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126#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plano-convex lens is to have a focal length5 /yz pwa* -+ tqf*ac4jdetzb6 of 40 cm. It is made of glass of fj+t*eqz4t-ya 6w *apbcd /5zindex 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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