Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, and the formation of images bkui4 3xg )7mrpy mirrors and lenses has been successful described by the3pru k)g4x7mi

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 incidencei *sk+,jfv w:q

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-ge qbuv)78k t 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 image th68x xu4 /jetitiuy+d5at 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 im2q w*gn5e2aam6nd*43(ag,dk cc emjw ages 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 d4pv(i-p ;d f jts ydwcay+61z. dn,;oho not actually pass through the image locatiojcf +hpwdn- y o,pvd6;(d 4za.1;siytn, and 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 the;kbym 7/rtzc)9fs 1crough the image location, and could appear on paper or fil fck 9;btm1 ce)7/rszym placed at the that location is referred to as

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is it possible to see a virtua/gft:5 rv+a eg +lfu 3wusn.8vl 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 whicf ju)0 q. t*qouq x3g;,fbyva7h reflection takes place on the outer surface of the s0fqga f*bo 73,tju ;qxu)q v.ypherical 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 reflecii) p 8inzf2o in:j*e8tion takes place on the inner surface of the sphere is referred to as2eopi8ifin n)jzi: 8* 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 mirrx3db xu1b/.welf0 h ehyg4 5 it1pd8e+or is r, the focal length is

A. 2r

B. r

C. r/2

D. cannot be determined from the information given

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling parallel to a concave mirror's axis, s(b,l/axko; x q4x *ydetrikes the mirror's surface near (/dlob xq e4xa, k;y*xits 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 theuho i)goadmy)0 .-, o w*pujb)/qds(d 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 a concave mirror's axis, cros) jvj3a 1zcyv9ses the axis at the mirror's center of curvature before scy 3)1vj 9jvaztriking 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 onl rr:w)a5pxp..g3 ca.m(ry t l a path through the center of curvature is refle a(rgp xc5pa.y) .rtr 3lw.m:lcted

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 5q.(/hjyqn:y jrp.iuto a concave mirror's surface, crosses the axis at the mirror's focal point before h yrpu.(q j jyq/.:5nistriking the mirror's surface. After reflection, this ray

A. travels parallel to the mirror's axis.

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

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

D. passes through the mirror's focal point.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mirror on a path thdtha:b m1dk; j3ht0,s46gcjvrough the focal point is reflected6h1ds d gbjatt,0 :;3vkhjmc4

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 poszoa9ya9 ap f1a*4yp/ pition due to a curved mirayf4ppz1a/ yao9 *9ap ror.

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 me+p:.,rjty -d q.bcofocal 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 d.a3fy z 4fd/1s9xbte center of curvature. The image produced by the mirror is d.1fsdxafy/b4z 93 et located

A. out beyond the center of curvature.

B. at the center of curvature.

C. between the center of curvature and the focal point.

D. at the focal point.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is positioned between a concave mirror's center of curvat()e/khe k 2pn 6m5iz4g*u8:ved dikosure and its focal point. The image produced by the mirror ise8 2hmd6ee*45o(k:)kiki z np /gds uv 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 andn2 2 k73inrvxd its focal point. The image formed in this casr nd7xik 3v2n2e 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 tn-pk.pocjwx9bby j(1y) 0h g . eul8i:++ dpmmhe same distance from it as its radiu pm)k +p u.lhjwjp:18mcoy.i9y0d geb n+x (-bs of curvature,

A. you won't see your image because there is none.

B. you won't see your image because it's focused at a different distance.

C. you will see your image and you will appear smaller.

D. you will see your image and you will appear larger.

E. you will see your image at your same height.

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a cof* h tnlzyt7;8k46wow nvex mirror, at the same distance from it as its focal length,w4 olzwtf*k6 h87;tyn

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 v. snv k3)c, n+xz;lbpe5nu +na magnified image (a great big you) anlvbcnnz; ,35 )xs+ pkn. +envud sometimes you see a diminished image (a little you). If you look at the bottom (convex) side of a shiny spoon, what will you see?

A. You won't see an image of yourself because no image will be formed.

B. You will see a little you, upside down.

C. You will see a little you, right side up.

D. You will see a little you, but whether you are right side up or upside down depends on how near you are to the spoon.

E. You will either see a little you or a great big you, depending on how near you are to the spoon.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Concave spherical mirrors produce images whivoyf(*awo haf6 vv,:,eks8 4ech

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 wh j/,1gvevsk;iich

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 image which s+w0d*ozkw*hb y**mh 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 anp;bc zk2f 84tg 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 for a mi1qa/r0:sijal4 al gp3 rror 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 positiv8n1wy8ia7 rf;uoi *e:n:duc ke, 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 negative, the image for v; av ox-ya-uvhw8x5 4k+/jz/z-ie xxmed 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, the imt/ 1pv4x/itu 0tvttm q67z,n7byu;b wage 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 negatip96k w ae9lf rav1hs42ve 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 tha*)o l(bzccqg (n one, then the image is)o (cgz(lcb *q

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 the image 4 f32ydij p6,iodbvt3b6c8 oq isbj o,op 84 cqiifyt3 v366db2d

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 tgr ,, gt3ui*d j(kys3io 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 fastes5f54r f n;mncta2tc( ct

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 substanc iqns jaa 5 v4kg9:m9o m9m m6jai6tl*h1sun7-es, 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 ;im:oyap ols 4u3s ,q7jv 1x:dwould imply

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

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

C. refraction is not possible.

D. reflection is not possible.

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The index of refraction u*f6x*ctx 9 6l1at i;hd 8ieqwof 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 incidenceoin/t * 9g-wg;1focpn

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 mediumb8p2mwbnu gu9: 5vl3k 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 refracte v ;9c+acp3zyhixk/ )ion will be

A. greater than the angle of incidence.

B. equal to the angle of incidence.

C. less than the angle of incidence.

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ray of light, which is traveling in air, is incident on u7s2otl ,uex) e-(a(u hoorhs 0yf2 1v+xg-l ea 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 whi jj- r ghdzx2-2+phzh3bhb5vnu04-such fiber optics is based is

A. refraction.

B. polarization.

C. dispersion.

D. total internal reflection.

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The critical angle for a beam of light passing kc. 4 )nek um+;htqs.sfrom 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 wo0i)s2,s:x dmg jux 1qnrk 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 thickest6oxw2u3 :z.m )rpaya*mlr a -z at the center called

A. converging lenses.

B. diverging lenses.

C. either converging or diverging lens.

D. can not be determined.

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thinner at the center than the w 2j6q u97f:ymskolyiu/ 48nn 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 thicke(ttnf lvfhf8++:r m/ilc4zm2 r at the center

A. spread out light rays.

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

C. have no effect on light rays.

D. reflect light rays back.

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two diverging lenses are similar except that lens B is rated at 20 dioptjl:(41 .e 0 j2 -jonz7eu ckk*dxlgtjgers, whereas lens A is gj.12lz e0e-(k7jxl nd cg4:tu* jjokrated 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, f 0csn)50 asu.pc bgm ;zn okv/u;gq92strikes the lens near its midpoint. After traveling though the lens, this ray emerges travelingbg02fcunov cakqsp/z;)n; g 9 5 usm0. 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, su juro**.c)c* v-lhwqtrikes the lens near its midpoint. After traveling through the lens, this ray emerges traveling obliquelyol)cwcj . *vhu*u-r*q 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 imlqee 7vy5z+e-a2*1tu- pb0uxdbh pw :age position due to a thin le d7*te2:p-p1eb v hy+q5 buwa-0uxze lns.

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 fo 2on12 il7qqdwcal 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 focal ol +/+jx4,nbdkjyon9 ;-wmtflength $f$. 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 foed xss(;0f t*v-d5t pgcal 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 lpnu.;b ouq/-gength $f$. 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 leng99jo n .fy/cm7j47kuk zw9mzepi kr++ th $f$. 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. Tksr xv -*-mz q3kw5, w,da*lpuhe image formed is3xlmkvq*sd5 z*,-,kwp a- ruw

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 concquuk5c l 3p3-s9eh op7ave 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 eqqehuer)1 , fe:m0a,n94isumagnifying 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 // wh4 )zcocxwscreen. Between the lamp and the screen is placed a converging lens of focal length 24 cm. The filament of the lo)hz 4/w xcc/wamp 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 8gdhr 9,ehz0konrbi,xqtu;. *hk;v3yq8q 8klengths $f_1$ 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-con *-qvwmlg r;cuc m,wwu 53av8 )9rn5k0uxjqt-vex) lenses are placed in contact. If each has q 53wc q8 -rlvr n;,9wg c)uajxtu*mw0-v uk5ma focal length 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 s(h*7 v9lhlm xdre-+o reflecting surface with an angle of incidence of sel+rdl -(ho v9h*xm 7$52^{\circ}$. 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 mirr(y gtl5498t fdo 9bkpjor. The image formed by the mirrob98po t(yd49j 5klgtf r appears to be

A. 1.3 m in front of the mirror.

B. on the mirror's surface.

C. 1.3 m behind the mirror's surface.

D. 2.6 m behind the mirror's surface.

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far are you from your image when you stand 0.75 m n5loor p3qus 9.pf6v6em b)v,z6j(bx in front of a vertical plane miru 6,3(6xs5b.z qfonbmj)po 6el v 9prvror?

A. $0.75 \; m$

B. $1.5 \; m$

C. $3.0 \; m$

D. none of the given answers

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How fast do you approach your image when you approach a vertical plane mir3 xazn0. b.zj26sj sxsror at a speej6ssj2sx .0.z na3zbx d of 2 m/s?

A. 1 m/s

B. 2 m/s

C. 4 m/s

D. none of the given answers

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical concave mirror has a radius odu3m d7)iv/ysoy xo,,; bza6 w9 *bobjye)7 hsf curvature of 20 cm. How far from the mirror is the focal pointby) xm69boj sbd;*s )a/iohz,dy3uv ,7oy7e w 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 *1uua 5gynf +tcreates a real image 30 cm from the mirror. What is the obje g*fuay5+ nt1uct 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 colzvj84(4fxw3 el)rrs ncave mirror, and the image is 3.0 cm in front of the mirror. What is the focal length of the mirro lsv8fzx 3l44()ewrrjr?

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 b; 4r.d 5r b es5x8sj 3dom,jde.wb+vvwith focal length 3 cm. Where is the image3jv o.r+wr8s5d4ems.dd bb;jexb 5 v,?

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 objec nz-ea7ms ayc.:i,ed /t is placed 10 cm in front of the mirror on the mirror's axis. Where is th/dnm 7ia zasy- .:ee,ce 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 placedqg.xjcm,l)e9sfag ib9*6 1vu 30 cm in front of the mirror on the mirror's axis. Where is the imaga1lesvfqg 9 g ub.c,ijxm)*69e 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 4.73tf iu+jzk :lg j6bc/: cm tall, and 10 cm from the mirror. How tall is the objecl:+ tuzbfi kg3 j:6/cjt?

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 6f nyz+r+3kkywq.h awv;ey)r:(3 db nconcave mirror of focal length 20 cm. The object hv(3kn:; . yz+ 3e a)rfybr6wkw+q ndyis 4.0 cm tall. How tall is the image?

A. $1.0 \; cm$

B. $2.0 \; cm$

C. $8.0 \; cm$

D. $16 \; cm$

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80#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 47.5 cm tall. The image is 38.6 cmmodb3az6dv x;lpq,z4dw 15 .m tall, and 14.8 cm from the mirror. How far is the object from the mirrordxzz1 .pq3,5ow;mlv6 d mb a4d?

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*vw 6pn+e3m 2lv ,l9j+cxp iaj cm tall, howl+*ci6jwjp xepl amn v3v,9+ 2 far is it 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 20 cm. The on p7ls 3(2jnnpbject is 4.0 cm tall. Where is the ima2psp3 7l(nnjnge 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 fz1 qd7 bggj)5kzrp0c,ront of a cosmetic mirror (concave mirror), the erect image is tw07z1 g)pdqz,gj brc5k ice the size of the object. What is the focal length of the mirror?

A. $27 \; cm$

B. $40 \; cm$

C. $80 \; cm$

D. $160 \; cm$

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A person's face is 30 cm in front of a coo-nd i3.s9 -roknhg+pncave shaving mirror. If the image is an erect image 1.5 times as large as the object, what i. s-og-r9io+ndphn k3s the mirror's focal length?

A. $20 \; cm$

B. $50 \; cm$

C. $70 \; cm$

D. $90 \; cm$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image is 4.0 cm behind a concave mirror with focal l m-imn,2u 887r;jthoih l u z(eb),ypoength 5.0 cm. Where is they 8i28uu,pbo lm (7eni h,t-mj)rzho; object?

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 g16v toc ,of7mfocal length of -20 cm. An object is placed 10 cm in front of the mirror on the mirror's axis. Where is the imagt, og1vcm f67oe 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 mirrorbyy*l8xjs ytt r2/i3, has a focal length of -20 cm. An object is placed 30 cm in front of the mirror on the mirror'yr2t ty8is3x/ly,j b *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.0i4lqsyhyh 1c: h-*kt The image is 5.8 cm behind the mirror. What is the focal k -qihc:hs y10t *hl4ylength 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 imapcc,y c cej/z 5 :b; rw-cr54ag1.crirge is 7.80 cm tall, and 14.8 cm from a convex mirror/c bry c5g. pwr rji;cc:5zec41c-a,r. 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 o hl*a9g dzu0*a5drp( 5ge nkgd7dp2 c)f refraction of 1.50, what is the speed of light through ik7e )5n 5cl2rg(ap9*g0 dp adu* gdzhdt?

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 airn p6y )e j6+z7bk6h2s/val1nawjy a +h to glass interface at an angle of $45^{\circ}$ and is refracted at an angle of $30^{\circ}$ to the normal. What is the index of refraction of the glass?

A. 1.23

B. 1.31

C. 1.41

D. 1.74

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters a substance fr /2cp6cxsi jy.om 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 waterwt/ 6z jjsni 593rly0ya1.bcg. 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 and evenly overpnz/v21by p* uq.ljs 2 the surface of water on a windless day. What is the angle of refraction in the water for a ray of light that has an angle z1p qsul*jnpv .22b/ yof 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 9qn+ vs m+rlvjlp2,b4surface of a 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 refractiomlr4lv9p+v+ns q 2bj ,n 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, travexy3goo s6wh r.)e q;sw3gl(e/ ling in air, strikes a plate of transparent material at an angle of incidence )werg36 xgs so3./;qo(hlwey of $56.0^{\circ}$. It is observed that the reflected and refracted beams form an angle of $90.0^{\circ}$. What is the index of refraction of this material?

A. 1.40

B. 1.43

C. 1.44

D. 1.48

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97#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A beam of light traveling in air is incident on a slab of trczo3t5t 95c reansparent material. The9c o3tzet 5c5r incident beam and the refracted beam make angles of $40^{\circ}$ and $26^{\circ}$ to the normal. What is the speed of light in the transparent material?

A. $1.0 \times 10^{8} \; m/s$

B. $2.0 \times 10^{8} \; m/s$

C. $2.3 \times 10^{8} \; m/s$

D. $3.0 \times 10^{8} \; m/s$

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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. Lihhd;t-lz0f97 7azrfmxlz6l b bub.8 2ght is passing through it at zb9bhx67tz7 ua.z2b f0d-hrll8l mf; $53.0^{\circ}$. 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 rj,6dyr8 tcxwi4) zl -2kyw)y for light traveling from crown glass (n = 1.52) into water (n = 1idy6-w4 ktw2lxjcryy,))8 zr .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 uy6d:c72g: y jvfhq 8wis its critical angle of incidecgyd6 hvquj27:8 yf:wnce?

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 c 5.sghir5o63b+ti r we:7xqdi ybc 3u+lear plastic with index of refraction of 1.50. For wh. y i3h:gr7ci t6oewqr+bu5 35bisxd+at 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 subtj eer4qm gqzw*i4xd 0gq3h2u,dk/rf2 3e.n *stance is measured at $57.3^{\circ}$. Light enters from air at $45.0^{\circ}$. At what angle will it continue?

A. $34.7^{\circ}$

B. $45.0^{\circ}$

C. $53.7^{\circ}$

D. It will not continue, but be totally reflected.

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103#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters a substance from air ljn b610kqe;ad+e l5j 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 3 m sdy8q.2.) fryhz7ut: sksuhas a diameter of 20 mm. Its ends are perpend drt k 8:2.y.3ys) smuh7ufszqicular to its axis. Its index of refraction is 1.30. What is the maximum number of reflections a light ray entering one end will make before it emerges from the other end?

A. 42,000

B. 26,000

C. 24,000

D. 18,000

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105#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 40 cm in front of a 20 cm focal length converging lens. H*+m7mfw) ge+pqbse) zyh,; upow far is the image of this object from pqgfe p m )wy+z)m+*h,es;7ub 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 len ay o6spzdr5-2)ik x9ys with focal length 4 cm. Where is the)5 -zkxas6 2ipdy ro9y 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 i)sb sd.0yby6n fet+m4s 4.0 mm behind the lens. What is the f dyf4+s0emts b)6b.ny ocal length of the lens?

A. $11 \; mm$

B. $5.5 \; mm$

C. $3.8 \; mm$

D. $3.2 \; mm$

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108#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 14-mm tall object is 4.0 mm from a converging lens. If the image is ad+0 z3dkr xr+4.0 mm tall, how far is it from th z3rdakx0+dr+ e 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+uwme+ mzkru)q4u;ed;5 /mrc m in front of a converging lens the inverted image is half the sizm m+uc zrwu ke54/m;uer+ ;)dqe of the object. What 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 v28ew.lmnp(xs x)a. x of a converging lens with focal length 5.0 mm. Where is the ob(x )8mv2x.xase.nwl p ject?

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 conv;x (7(v*jh nflum+gvu6ruf7gerging lens. The image is virtual and 6.2 cm tall. What is (7gujlfum(+f7 ; 6 *nuvvxrghthe focal length of the lens?

A. $6.8 \; cm$

B. $10 \; cm$

C. $16 \; cm$

D. $30 \; cm$

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112#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 15.2 mm fro eb zd,g,.cjnj-au1g( q5b 9dkm a converging lens. The image is 4.0 mm tall, and 9.0 cm from the lenkz g bb91jd5n -ed(qu ,gca,.js. 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 conv5ti;yzm vefjb(x 3m-6 .t2hd eerging lens, it forms a real image. When the object yed b;xem2vh5(6ji. 3mz f-tt is moved to 40 cm from the lens, the image 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 lens. 0cvl3qs t4z vk1h1)l z The lens has a focal lezk l40t11z qv 3v)lschngth 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 of a diverging ad:mc;6tjwx vu*h y05lens with a focal length of 10 cm. What is the imagecmy 5x*ja ;dt wvuh60: 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 3m 4jvwmioul3;26e q4o 0 cm in front of a diverging lens with a focal length of 10 mm 2uiqolw e3o4;6v4j cm. What is the magnification?

A. 0.25

B. -0.25

C. 0.67

D. -0.67

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117#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 10.4 cm tall, and 4.8 cm in front o r)/iso pzv0;h b(ydx(7itv;vf a diverging lens. The image is 4.0 cm fromdbrtv(; hvz/i);sy0i(ov x p7 the lens. 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 diver,)vyxy e0y**zd p6 rgqging lens. The image is 2.5 cm tall, and 7.5 cm from the lens. 0)gpvxe ryz qy,6* dy* 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 o1pkm 8z4hkmr fr 5u7)dknv1-sf 40 cm from a thin lens. If a virtual image forms at a distance of 50 cm from the lens, on the same side as thn r5 k41h1vf uk8)s7k-zdmmpre 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*l7du;r;yi qt vz2vr4 50 mm must the object be placed if it is to form a virtual image maqy;zr24rvt l7dui; v *gnified 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 iy .h2j kxaij:ae) 83jmn many 35-mm cameras, must an object be positioned if ityax):ja ei 2jjkmh38. 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 20 cm, are placed in contact. Whbfd3+mtn rzudp84rdc,*v 1u 9at is the focal length of this com r*1 +c pvrf 3dmt,uzbnd89u4dpound 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) yl5tka-/ 6mhithin lens has radii of curvature 46 cm, and is made of glass of index of refraction n = 1.60. What is the focal length hyialm5-kt/6 ?

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 radpzffzs78w - bfzq:i.0p9e o-jius of 40 cm on the front side and 30 cm on the baf7 .fwbz 8z:iej 9 --qfops0pzck side. What is the focal length of the lens?

A. $11 \; cm$

B. $34 \; cm$

C. $80 \; cm$

D. $240 \; cm$

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125#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A biconvex lens is formed by using a piece of plastic (n = 1.70). The rac 9gd:6kqiovoy6 t sh-t(j1)ndius of the front surface is 20 cm and the radius of the back surface is 30 cm. What is the focal length of theo1yj6(tcoth-ns : v6iqg)k9 d 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 g)e0msj l-1l mis to have a focal length of 40 cm. It is made of glass of index of rej s1me)l -gl0mfraction
1.65. What radius of curvature is required?

A. $13 \; cm$

B. $26 \; cm$

C. $32 \; cm$

D. $36 \; cm$

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