Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, and the fouc2h2g49bnv z cn40-e yd .szsrmation of images by mirrors and lenses has been successful ng-9h evccs2zn s.y bdu042 z4described 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 incidenzofqs5-8a d;y ce

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 whic,-nstnji6 xj /h 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 t scxt-h2nd3)*ibg4tnao5) i nhat 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 produc9fitd3. vbtgex/btp,/u 0; (krfx0jae 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 pas j1sn.fa0vw3cs through the image location, and woc svj1 n0faw3.uld 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 ra8ti*zmusdrg6a ie +. ,1/ pk qfv4f0uyys pass through the image location, and could appear on paper or fiu+y4z 0*uif.gad6tki/mp f,r1 evsq8lm placed at the that location is referred to as

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is it possible to see a virtual iedb 4ed+7d6(ax7 n,dolzi (cimage?

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 whemya /ew,fnxxp;*s;; wq9-s6s40r 5dis hkjmich reflection takes place on the outer surface of the spher4mj/wikr 9f-h ; yexe 5m6x;wsp;,q0ss*an s dical 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 reflection takes place on the inner surface tcu,ki p/. kjx91zq l3of the sphecjk3pz9li.t1qx /,uk re is referred to as a

A. convex mirror.

B. concave mirror.

C. plane mirror.

D. double-sided mirror.

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the radius of curvature of the cozza ;ob. jr2ft:l447d3is 6z s2xy vgbncave mirror 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 ax;2ytmcqk , j vsbfd.+)is, strikes the mirror's surface near its midp2kyvd.+ t)s;c,bqfm j oint. 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 con m a6l gi82k8-iq+z/lm fh:xruyt5d1s cave mirror on a path parallel to the axis is reflected

A. back parallel to the axis.

B. back on itself.

C. through the focal point.

D. through the center of curvature.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling obliquely to a co*ynjmtmq1+5-2 gsi vpncave mirror's axis, crosses the axis at the mirror's center of curvature before striking thesmt2pnq*i ygmj15+ v- 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 s x90gic2a.1 2 pdrvvzcc i:5con a path through the center of curvature is reflected 5pc90vsxic vg 1:c .r2c2zaid

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 0ke88abcr+4jzrnck e,z 7r j( a concave mirror's surface, crosses the axis at the mirror's focal point bee 0 e 8ab4czc+, jrrk7jrn8k(zfore striking the mirror's surface. After reflection, this ray

A. travels parallel to the mirror's axis.

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

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

D. passes through the mirror's focal point.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mirror on a path through the ,lsat2f .dp+)s/ ldieh*0uzyfocal point is reflectestza/2 l0 dde)hlfips u,y.+*d

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 findinv p2b,kmpav-w fr4 8rhyzke3 *u7h/. dg the image position due to a curved pbzp-/d*,vuw r7 8h .mr4yhak ev3k2fmirror.

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 ag5aobb 6yi)fw +mt,g 9m3s 5kqqoi-/et its focal point,

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

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

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

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

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

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a concave mirror's center of curvature. The imageq+os-uhgyfx ykpn qxrdtg.7u ;-3)g7 f402ga produced by the mirrorg;g)f +tq.qx2 agr3nu -gk-y774uf poy0 dx hs 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 mirr2: ezaqj5yu6yor's center of curvature and its focal point. The image pr2q u6y 5zy:jaeoduced 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 mirr66q2 wjgj-fh zne6q+v 6 x:ivh-y3qm ror's surface and its focal point. The imafyqjvig :z- hqrx63n 6-j ew2h66v +mqge formed 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 aeaupd ;ihqb w;h.v :m;;*vlvcr1h7 o4 convex mirror, at the same distance from it as its radius oe:aiolq c*r;; v;;.wm4v uhdbv 17hhpf 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 convex mirror, at the same d8tm,6 cfz4mx g ezitsfwc965pyc++,q7 t 4rvristance from it as its focal lenmqzpcty, fx6 5fc47t itsz8w+ e+c 9,4vmgrr6gth,

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 magnifxm6ui r+y1yskh 9lk4 r*9o(f cied image (a great big you) and sometimes you see a diminishlxr (o6r4c1smu k 9yf*i yhk+9ed 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 whichfpqs0tk-k z2d ynu/92

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 mirrorh8p1 ca1 z b99eoli+dqs produce images which

A. are always smaller than the actual object.

B. are always larger than the actual object.

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

D. could be 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 produc-d ,m lab6peg5es an image which is

A. always virtual.

B. always real.

C. real only if the object distance is less than $f$.

D. real only if the object distance is greater than $f$.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single convex spherical mirror produc/*cqyu,- ;eatn 9smp8dv d( azes an image which is

A. always virtual.

B. always real.

C. real only if the object distance is less than $f$.

D. real only if the object distance is greater than $f$.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A negative magnification for a mirror meaiw0 fi b,/vrv4ns

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 positiv)9 +zx6w 0 nkkq2yhvxle, 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 o) 7srti;m9p-j/bf- pz w.sfd 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 positive value, the imh( /kz c6mtrj;jia pgr4af66 3age 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, the6x -*imkl3 vb-wp b,qin54h ca 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 magnifico/:kmeu b( 3gdation is larger than one, then the image is (g:kbm/o deu3

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 th5v37a7f1suvazj b fc5 rmh xr-dy;59qan one, then the image isrc35-jvhv755y7qzfmaf dr b;x u1a9s

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 to one, then thejjfqxi*2 -gsclv m3v,d: mg,7 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 fastesadgw,g )5yc z8t

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,u4w2g0yli dn(b 1rb d9 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 occenvw+u7 o2xt5bp;0* g-iqyne 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 refraction of diamondp ec+99ncot2v 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 incidenovc 1 d*ftzj qbfch;. (k2zs9uv32 ww2ce

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 anguh1*j lksk / )gjaal0,ee-sf2le into a denser medium is refracted

A. toward the normal.

B. away from the normal.

C. parallel to the normal.

D. equally.

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters air fromh8 /us 1c+pn: 6pv cim4vmcan- water. The angle of refraction 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 i)5lq-e g 8tllk f-8jdyncident on a glass plate at a $45^{\circ}$ angle. The angle of refraction in the glass

A. is less than $45^{\circ}$.

B. is greater than $45^{\circ}$.

C. is equal to $45^{\circ}$.

D. could be any of the above; it all depends on the index of refraction of glass.

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which fiber optics is based isifvf (hy q 5 fx e/(rn34f)a8/juogn.a

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 pas - lp.7ejp4rdkoki1s)sing 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 whicatp/ n(yog kabv+r7.+ h 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 auv6 fdlsy6g q2hc9v(r,ws e8 ;6gmi9pt 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 edgnoer3y6 3rbx2 es 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 atnhd(w 1ehf(h; 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 20kp9b1 vsghy22 diopters, wherv2 b1pg2sk h9yeas lens 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 6t2y gspjfei(..mbqd5+)o3u0aq y lz parallel to the axis of a thin concave lens, strikes the lens near its midpoint6zjm(y)b q.u it l.5qa0go2fp3e +dys . After traveling 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:dox;elgv) (gq+k+ge of a convex thin lens, strikes the lens near its midpoint. After traveling through the lens, this ray emerges traveligvgleexd:o+ k g(q+;)ng 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 due 7 zjaxc -:dszge.h55x8 l7gi rto a thin le- rd58gza7hl7iejxc:gz.5 x s 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 focsao3(rs*gkvs .z)r 8yy. f- hial 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 length ylmexg .68v*/he 5 tys$f$. 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 foca/ q s*n;f(ct+zt-6z5pstk fvs l 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 length 90j/os7ur .g- vapxq r$f$. 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 l5s9zc krvt;f r8savjl d/,2 . 6xn4rfuength $f$. 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 5m9l)8zwf wr : ;arqhffocal point. The image formed iszr 9 l58ahwmf)r qfw:;

A. virtual and erect.

B. virtual and inverted.

C. real and erect.

D. real and inverted.

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The images formed by concave lensesmuy deoe5-mue(us4 ;p9ik6 skwl5w 4m3et ;7b

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 rar8mj 85b :szxfr exdn+vw-,) ede stamp you 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 screen is placed a uh+rtd ,b 9dx373 x+eg3sffsz r;i; o,ux(bpnconverging lens of focal length 24 cm. The filament of the lamp can be imaged on the screen. As the l dr+ i rotgpzx;s; x,b+ub7 33sh(xn39ufd,e fens 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 length+ jv48 fd:tqb)btdvc* sw b(:ls $f_1$ 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 (conrq,s ueyp .(d)vex-convex) lenses are placed in contact. If each has a focal length of 20 cm, how would you expect the combination to rs(,equ.p )ydfunction?

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 on0td2pq 0 tzv j)b:f8o+mfn1++ybpk reflecting surface with an angle of incidence of bpz+ft8vp t0 +b2)d+ 1fqy:onj0okn m $52^{\circ}$. 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- med6yi(-xer e umt,1 a plane mirror. The image formed by the - me1drtm- y,e6uie(xmirror 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 in front of a vertic)z :guv9llell8 m56.vpq8 tsral plane mirr6 9 :s8rlgvlmtqu8)lpl5 ev.zor?

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:vnt nr4pv-p:j cf0 ;u mirror atnf:- u 40pjc vnprv:t; a speed of 2 m/s?

A. 1 m/s

B. 2 m/s

C. 4 m/s

D. none of the given answers

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical concave mirror has a ra tk)ugydk kd 4+ oxd0vmc1-00adius of curvature of 20 cm. How far from the mirror is the focal point locate-k kdd d+uk ma04xc1y 0ot)vg0d?

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 i8 u/u.olgy4ukhh ;njj -2j+ qp3g 5wua radius of 20 cm creates a real image 30 cm from the mirror. What is the hu-n2phk/l.i4 g+uoyu5jwgj ; u qj83 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 ir+x2 qi1evkvc.u0 n8gs 3.0 cm in front of the mirror. What is the focal length of8g qki02 er.x vvu+1cn 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 3 cm. Wherqjo; uj ;-cy)peml.5re is th j;cul.q yrep)o5;mj- 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 -(u-*r h/gzs+ vrt67hyv zfllhas a focal length of 20 cm. An object is placed 10 cm in front of the mirror on l6(rv v + zs7h *lgyuz/-frht-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 )ip 24y vew-zpy5y5bxj9jq f-posv 50 20 cm. An object is placed 30 cm in front of the mirror on the mirror's axis. W2sq5p5ow-5jv 4yb 0xjvef-y9 iyp) zp here 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.bdypn21om 4*p q1y2t59puo zv 7 cm tall, and 10 cm from the mirrod y m4z19o221nvp*o5upytqbpr. 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 m(6hyqdmgy x*pcy hz(-0yxkv d( 59/rcm from a concave mirror of focal length 20 cm. The object iscrv0/6h(yyx mdgy9zy d *( (mpxqk h5- 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. Thwyn2pm+- yan9e image is 38.6 cm tall, and 14.8 cm from the mirror. How far is the object from the mirror?92n w+yanpmy-

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 coxwh8k fxj nvbh:7ey7 -d 4yf*8ncave mirror. If the image is 4.0 cm tall, how far is it fromnk4dhx bvx7f7y:-ye h8 wf *j8 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 blv k*y62cp:afocal length 20 cm. The object is 4.0 cm tall. Where iska2 :vyp6l cb* the image located?

A. 12 cm behind the mirror

B. 12 cm in front of the mirror

C. 60 cm behind the mirror

D. 60 cm in front of the mirror

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a person stands 40 cm in front of a581gr+ ; sc(idktfty r cosmetic mirror (concave mirror), the erect image is twice the size orky fr+tc8 id sgt5(1;f the object. What is the focal length of the mirror?

A. $27 \; cm$

B. $40 \; cm$

C. $80 \; cm$

D. $160 \; cm$

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A person's face is 30 cm in front of a concave shak* yws2 v ;jwqza(8h/tc0d7idving mirror. If the image is an erect image 1.5 times as large as the object, wts(0/c i;jadvqw kh*w2y 87dzhat is the mirror's focal length?

A. $20 \; cm$

B. $50 \; cm$

C. $70 \; cm$

D. $90 \; cm$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image is 4.0 cm behind a conca8aqpuq v81e6u nz)l it-buh3)ve mirror with focal length 5.0 cm. Where is the oi3hua8lne)qu6 8tpz-1b uq)vbject?

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 p/t* p3 we u l:skz-oeq5;)mnsp6jbgr)laced 10 cm in front of the mirror on -*5p6wpjtn3;e z rblk:s e))qgums/o 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 mirroqzu9(d kp 4)nlr has a focal length of -20 cm. An object is placed 30 cm in front of the mirror on the mirror's axis. Wlzpn49( )dkquhere 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 behind the:+lcu 7aitpbx 5o8wn: mirror. 8c::+n5xapt olb7uiw What is the focal length of the mirror?

A. -4.1 cm

B. -8.2 cm

C. -9.9 cm

D. -20 cm

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 8.90 cm tall. The image is 7.80 cm tall, and 14.8 cm from a cong0g.zptx (dgc /ddt/at m-/r uw/w)+cvex mirror. What is the mirror' dx+ wtdgczptadc rwg)/-//.m(0t/ug 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 refrac87+c;wixi ccpgpm(c) 8iny/,kgtdw ; tion of 1.50, what is the speed of light thr i 8 xgi) tcwcy7(cpn8/wigk,cd; m+;pough 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 ib -ayt d/kd ,c kwup /*x/rj-+bn-e8ksnterface 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 frlx j rcjs*btju)z 6(2f/eq cl28)z 9zoom air at an angle of $32.0^{\circ}$, and continues at an angle of $23.0^{\circ}$. What is the index of refraction of the substance?

A. 0.74

B. 1.11

C. 1.28

D. 1.36

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light passes from air to water. The incoming ray6p(ni,ao8dzdm(7 og y0x gok i4(0jco 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 iu(duedaqm5*jftc4r u ;v v e.r:6rx,0s spread smoothly and evenly over the surface ofr;0.ad,vu6rfq eu4(vcrm*5:juedxt water on a windless day. What is the angle of refraction in the water for a ray of light that has an angle of incidence of $45^{\circ}$ as it enters the oil from the air above? (The index of refraction for oil is 1.15, and for water it is 1.33.)

A. $27^{\circ}$

B. $32^{\circ}$

C. $36^{\circ}$

D. $39^{\circ}$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diver is 1.2 m beneath the surface of a stfg k((/wtq7):im x8nkfhp2 yoill pond of water. At what angle must the diver sfo(2 pg8mk(fik)x:n t7wqhy /hine a beam of light toward the surface in order for a person on a distant bank to see it? (The index of refraction for water is 1.33.)

A. $41^{\circ}$

B. $49^{\circ}$

C. $59^{\circ}$

D. $90^{\circ}$

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96#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A beam of light, traveling in air, strikes a pl7p z/k .7dvk rlkn:f0hate of transparent material at an angle of infzkv 7 kh/dkr:l0n7 .pcidence 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 iyc;ntfvp7: p4.yxgr+7/nf:kf1 ixedncident on a slab of transparent material. The incident beampg7d k yf: .cx nevrf/+1p;tn x:4yif7 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. Light is passing through it oa:imxr.:ck yl0b.d,j 9 x:chat cx:l,mbo:achx0jky 9 .i.dr: $53.0^{\circ}$. 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 = 1.52) ibo9v dwm*a5h )nto wavwhoma9b d* )5ter (n = 1.33)?

A. $42^{\circ}$

B. $48^{\circ}$

C. $57^{\circ}$

D. $61^{\circ}$

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100#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lucite has an index of refraction of 1.50. What is its crit pf4bbi6i0.km sw195t 83wxv1sq/ j3lroh kqnical angle of incide sl8wp.iqmwnofsk6jb rq3hv4tk i1b9530/x 1 nce?

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 plmm*61vng(egco9o+xt/ze: .i0ab iv p astic with index of refraction of 1.50. For what angle of incidence o mv (bagezg c :iv.9/6x0t+i onp1*mewill light remain within the plastic "guide"?

A. $>23.4^{\circ}$

B. $>38.3^{\circ}$

C. $>40.3^{\circ}$

D. $>41.8^{\circ}$

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102#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The critical angle for a substance is measured a8+3 lae*q;6o qjalajst $57.3^{\circ}$. 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 fromrw2d p29)cn*6rf qmit 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 diameter o5 ejb4tb wb.t4s7(acx f 20 mm. Its ends are perpendicular to its axis. Its index of refa5(bb tb.t 4je7 wcxs4raction 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 wp7l *hogk7:og go5l5vn d2vejm48 g ;front of a 20 cm focal length converging lens. How far is the ima g:5elgwdgk2ojp 7v7ho5* ;v l84o ngmge 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 with focal lenq2gz6j6(pfk d gth 4 cm. Where is dgpj f6 q62k(zthe image?

A. 8.0 cm behind the lens

B. 6.0 cm in front of the lens

C. 6.0 cm behind the lens

D. 4.0 cm in front of the lens

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107#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 15 mm in front of a converging lens, and the image is 4.0pzvfcyo2 6m:) u2,xd pkpt0oq;*3jll mm behind the lens. What is the focal length of the ;*yo 0dlxuop)q tcm6v232jpzlp:k,f 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 mtiedy2r1y g/f ; ..cpd7 myjd)hq4xeo;o, 7rdm from a converging lens. If the image is 4.0 mm tall, how far is it from th.rjyd dxod7gi)/otyc;7;q,dyf me4e2. ph1re lens?

A. $14 \; mm$

B. $8.7 \; mm$

C. $1.4 \; mm$

D. $1.1 \; mm$

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109#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When an object is 40 m in front of a co /436q .qplmjt uqs ;oau3+pnbnverging lens the inverted image is half thqqb u +qo;pu3. /n slp4jtm63ae size 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 of a converging lens with focal length 5.0 mm. Wls2 t w(j.ldd khx8e e8w61te:here sjt: d2e el.l 6kxe( twhw81d8is 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 convergin,f68xufh:tewklj2u qz x32n . g lens. The image is virtual and 6.2 cm tall. .fqhwt ux 2:uz x6,2kjln8f3eWhat is the focal length of the lens?

A. $6.8 \; cm$

B. $10 \; cm$

C. $16 \; cm$

D. $30 \; cm$

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112#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 15.2 mm from a converging lens. The image is 4.0 mm tall, and 9.0 27s6qzozct z1fjh /3yt kr3 *icm from the lens. How tall is thfj3 t2iq*r 6ohy1kz7t3c/zzse 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 convergiqer:-i, lo zn7p.tc k9ng lens, it forms 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 lz9 pkn.i,oce -7trq: 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 306xy sts7 alhk*b93b,arxc 3a0 cm from a thin convex lens. The lens has a focal length of 10 cm. What are the values, respectively, of the image distance and lateral magnifs,brl0ax63 ak th3x97 *as cbyication?

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 ofl z1:7uj+5l jx-p dgcx a diverging lens with a focal length of 10 px+ul :7djg5jlc1zx- cm. What is the image distance?

A. $7.5 \; cm$

B. $-7.5 \; cm$

C. $15 \; cm$

D. $-15 \; cm$

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116#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at 30 cm in fr1ijk+4*n kzae qb5z2 dont of a diverging lens with a focal length of 10 cm. dq*5 n+4 kezaib 2j1kz 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 of a diverging5 7hy fw*a w1s+xtvch: lens. The image is 4.0 cm fromaw1 7*y:htc5x+vf swh 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 de,;q752m)bdqj/u0 uzwmpxq e iverging lens. The image is 2.5 cm tall, and 7.5 cm from the lens. 5qud, 2epum0q/wjq bx7e;mz) What is the focal length of the lens?

A. -6.0 cm

B. -7.5 cm

C. -13 cm

D. -18 cm

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119#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a distance of 40 cm from a thin lens gai yfn*a8i 9k/*i)qz. If a virtual image forms at a distance of 50 cm from the lens, on*ikig/)8iz*q nyf9a a 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 object be placed if it is )hhiw +*b3vva qt2 g4eto form a virtual image magnified in size by a factor otv+gqi awb 34eh*)h2v f 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 in many 35-mm camerasqnuw6; b1u5p0 v( htjf, must an object be positioned if it is to form a realu0j5h(v fnw ;u pq6b1t 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 lengtxm2dbowx :l s01k *;svh 20 cm, are placed in contact. What is the f dokw1m: 02slbxs; *xvocal 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 curvatu l-lntlkfd6 93xu 3:acre 46 cm, and is made of glass of index of refraction n = 1.60. What is the focal9llu-dn3aflk tx36 :c length?

A. infinite

B. $38 \; cm$

C. $30 \; cm$

D. $18 \; cm$

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124#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A double convex lens made of glass (n = 1.50) hasm/(xpsot,mr qs 0o:u9 a radius of 40 cm on the front side and 30 cm on the back side. What is the focal len(mp xu0/,r9 smto qs:ogth 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 4f)ze:vl7 iuh plastic (n = 1.70). The radius of the front surface is 20 cm and the radius of the back sur izvl4u hf7e:)face 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 f 91crpx e,u r61icxx/xocal length of 40 cm. It is made of glass of index of refrcx/r uxecr6xp 1,91ix action
1.65. What radius of curvature is required?

A. $13 \; cm$

B. $26 \; cm$

C. $32 \; cm$

D. $36 \; cm$

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