Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, and the formation of imagee 33d3fsl m1k s yq,n)vubsw68tq w,v/s by mirrors and lenses has beens1lfn /,equ v k)ssdywb tv3q68w3m3, successful described by the

A. wave model of light.

B. ray model of light.

C. particle model of light.

D. none of the given answers

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The angle of incidence,b:y er. fp,yx

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 work isercuw 6.*;clb

A. refraction.

B. polarization.

C. dispersion.

D. reflection.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plane mirror forms an image that i5ia n7( iwdox ,,nydq:s

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 produczlih. ay ,+e;ce 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 ac*k2jpy(p) 6c qong pl.tually pass through the image location, and wouql)* jg2.pp(p 6oy nkcld 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 through the image locpta z+r9r0wos 17/vppt7h a 8e*d3oisation, and could appear on pa/ip1o tavs 9 a+pr 3*7rwzt8pohse0d7 per or film 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 vm dcpm/dm2cfwy *75ad 44l(eimage?

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

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

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

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

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

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical mirror on which reflection takes place on the outer surface ofm/gtrxznvd 1, e57aen/y( q h) the spherical shape is referred q7mghn5reva,xz 1t/d/) yne( 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 w +2 h*rpcd1lo9omv7 qthich reflection takes place on the inner surface of the s*lhm1 vdor +9 7qtc2opphere 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 concave mirro93levvucs m 0yw;0tm+r 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, strn41odykxt 0e9p0.a wo ikes the mirror's surface near its mdpoo0 0ewaxk1 4.t9 ynidpoint. 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 a1bub (f8(cl nxxis 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, crosses the axip oe tdv3nzxnw2o/5 1c4,cqw5s at the mirror's center of curvature before striking the mirror's surface. After ,z4ew 5otc512doq c x3wn/p nvreflection, 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 coar / 2-;uef6l0esujrsncave mirror on a path through the center of curvature is reflected6s2j- l;efr /uusa0 er

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 mirror's surface, crosses the axi3oc ;ac6suzi /s at the mirror's focal point before strikinua; 3zso6/icc g 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 focal point is reflectw1rjavli-u+8 +o1 gz 1hkn 3 pejl/q)xe1xejwg-jk)/l + o1phl vqri1+nu8 3azd

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 curvedzk dq1 s-(kjq8z ,ug+x mqzzk8u1s -q( k+gxjd, irror.

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,(; 7iwd; dhfg;5 wwkgkpw:w) f exactly at its focal point,

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

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

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

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

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

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a concan( krh l+q4 wcrtn7 ,dlp9n(2tve mirror's center of curvature. The image produced by the mirt+ rwp9q k t,2nlhc47((dn rlnror is located

A. out beyond the center of curvature.

B. at the center of curvature.

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

D. at the focal point.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is positioned between a concave mirror's center of curvature an4+e/s2w+;rok*ia k pr l:tf b lti(yr7d its focal point. The image produced by the mirror is loca y al/t ri7rf4rp(we k+tk*osl+;2bi:ted

A. out past the center of curvature.

B. at the center of curvature.

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

D. at the focal point.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is situated between a concave mirror's surface and i*; r,ploo9kk-m 3;gyem3 c uavts focal point. The iruva;3*-kgok3e;p cy l9, mm omage 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 a convex mirror, at the same distance frol5 jjgyk v1t )wri+ 8 cp:udam10l-,5gnv e4ahm it as its radivg wgltc5aj ,n5urp 1la eyj4 1+ :h0-mkdi)v8us 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 convex mirror, at the same distance fnc pzsip9: c2/mh-j5vrom it as its focal lengtchip-cj /vp nm5zs9:2h,

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 lyn/t3 ca hhwlu3l (y ;/5xu.wwook into a curved mirror you see a magnified image (a great big you) and sometimes you see a diminished image (a little you). If you look at the bottom (convex) side of a shiny spoon, what wil (l.lt/u xwcy5 a;/ 33hyhwnuwl 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 pe 3awhniiq2t(1 q)eu2roduce 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 image *kasifotgk6 ,1nxd5 t mab4 eq(;og1-s 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 mir/mg2n-oxfl o( ror produces an image which is

A. always virtual.

B. always real.

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

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

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single convex spherical mirror produces an i (jvps 5sfaa* n-:3pdwmage 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 mirn bs;lqi/55d-zk 3v rgror 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 posi ur trsm76yw.gf8(x8f 7lh4lative, 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 fd0/atvum 8j9p w* o3cef;qc5negative, 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 positivetlv4r5rw 4 il+q n6dwmxe2 -v) 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 nega/ ras4kavy, 6ftive 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 t672mi 4 hrehbshe magnification is larger than one, then the image is h2e7ibrm4hs6

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 imag ud45i 6k;.uda jcjg1easbn/i2 hzx3 7e is7;u ia e6ha izdsk5x2gcbju3. 41/ndj

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 theiswc-7- (peh s 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 fastestxi 3/:vfe9yw r

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 materia/hxl0ayee 8;u l substances, the index of refraction

A. is less than 1.

B. is greater than 1.

C. is equal to 1.

D. could be any of the given answers as it all depends on optical density.

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An index of refraction less than one for a medium would imp8mq8p 75 xicq.e pj71cxt(x ejly

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 rsg)e7fwjxr0 m2z(v p*rs96adiamond 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 incidenceorh9 xvg)z7rndkn kg v7())0 u

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 de6ravgg/h pmn7/8np im;pk48jnser medium is refracted

A. toward the normal.

B. away from the normal.

C. parallel to the normal.

D. equally.

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters air from water. The angle of refractif-rvh9fhlio ;vovvu: y zb, 8,d+,2bton 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 a glas-i*vzds9lbg)c ldeon;1. 8eykf + tb8s 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 b9(4weuocz8/p u:ka r z4h/rzfiber 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 fo: caq3pizd).xxm,l5sqi,2 fg;qb :gk r 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 which lensemu o5.*shho*(rt2 qeas 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 center c .(ar bqhj6+qpnie5u* alled

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 /hxmcynjo :u qs xo29y a6)4w6center 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 thick/dyf fl07 0vh;tq3sjgy(vl;wl0 aa a9er 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 i1s3py/+4l,9rhp ud gw(swnf zs rated at 20 diopters, whezr1+sgdufyspp wn , 4 h(w/l93reas 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 parallel to the axis of a z2sokza8 - /tdg/j/zg re3 9l8iwmtj+thin concave lens, strikes the lens near its midpoint. After traveling though the lens, this ray emerges traveling obliquely to t8d+ 2ol3tkwj8me j sa/rzt /-g9z/gizhe 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 ax;6 hygslr 3l-wpi5 m6fis of a convex thin lens, strikes the lens near its midpoint. After traveling through the lens, this ray emerg6yr;hl6wgps-ml3 5 i fes traveling obliquely to the axis of the lens

A. such that it never crosses the axis.

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

C. passing between the lens and its focal point.

D. passing through its focal point.

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55#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State how to draw the three rays for finding the ryp7krau uc+i3 kp: 13image position due to a thin len7aciy: r 3rkp1puu3 +ks.

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 focal1s95wq c/v1g5, s bhlidn,ril 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 focaly 3+r8adrf0 kg 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 focal lenoq bpkds( 19m3xf-ud )gth $f$. 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 focf19 ,gm6 2ueddxe(wdi al length $f$. 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 lenh ;3 cmdlk7u:8w nvxl/gth $f$. 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 beti9q ymr(tym16v;hi8e7eznt 8ween a convex lens and its focal point. The image formed is8teqvt(i;n96mh emy1r 7y 8zi

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 l5 tqt9hr/0hb+; kuwu ienses

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 rarc6otyted3x isc*6v5 (e 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. Be((sw jg.7 ts*m f4/ncem t5pn.uad/nx tween the lamp and the screen is placed a converging lens of focal length 24 cm. The filament of the.pn acxufs mng *4w(dne t7(m5jt.//s lamp can be imaged on the screen. As the lens position is varied with respect to the lamp,

A. no sharp image will be seen for any lens position.

B. a sharp image will be seen when the lens is halfway between the lamp and the screen.

C. a sharp image will be seen when the lens is 40 cm from the lamp.

D. a sharp image will be seen when the lens is 60 cm from the lamp.

E. a sharp image will be seen when the lens is either 40 cm from the lamp or 60 cm from the lamp, but not otherwise.

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two thin lenses, of focal /;( dh. p) k bdeqh1d.cgfdm)6 uqm 2n:wbsim/lengths $f_1$ 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-convex) lenses are placed in contact. Ifa.*xrv/ uk jo: each has a focal length of 20 cm, how would you expect the combia v.r/*ok x:junation 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 refl,tb5eob5 ybk413oh w hecting surface with an angle of incidence of 4 tbyowheb 5o1b5hk,3$52^{\circ}$. 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 mirror. The auf. p ;*4fffq:h6gplimage formed by the mirror ap. up;4ff:lpg*f afq 6hpears 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 frontan+ srmo z,3 *:oogk 6*kdahi+ of a vertical plane mir+mo*+*o63zas gnk :dho irak ,ror?

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 whei a4q cqe3q:sozsf04 ji+:v)mn you approach a vertical plane mirror at a speed of z coveqs:)aj04i siq:+43q mf 2 m/s?

A. 1 m/s

B. 2 m/s

C. 4 m/s

D. none of the given answers

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical concave mirror has a radius of curvature of 20 cm:zb; ebu9h/ky1ppt7 + .vg idf. How far from the mirror is the foctbyd 9 b1vi+g: uf phk./7z;epal point 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 cbpt v -o )h0c7nlb :+bb1ab3ijm from the mirror. What is the object distab ht 3lob+i7ba)vnjc0b: -1bpnce?

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 a isu1r52nu.x6fp l m1concave mirror, and the image is 3.0 cm in front of the mirror. What is the focal lengna.u6x pfsm2ri1 1 ul5th of the mirror?

A. $15 \; cm$

B. $4.0 \; cm$

C. $2.4 \; cm$

D. $1.3 \; cm$

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 10 cm in front of a concave mirror with focal lenn o04/w 0mkbwn flz7+kgth 3 cm. Where i+fkown b l/mz00 7w4kns the image?

A. 13 cm from the mirror

B. 7.0 cm from the mirror

C. 4.3 cm from the mirror

D. 3.3 cm from the mirror

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave spherical mirror has a focal length of 20 cm. An object is plrixd xpwezrgu z +6 q+9r;5e,;aced 10 cm ixzedz 6,+x5;r ;epr9gw r+qiu n front of the mirror on the mirror's axis. Where is the image located?

A. 20 cm behind the mirror

B. 20 cm in front of the mirror

C. 6.7 cm behind the mirror

D. 6.7 cm in front of the mirror

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave spherical mirror hjz cttqw8lg0 m2- 84n 7mnq -xmtnlycg89)2cv as a focal length of 20 cm. An object is placed 30 cm in front of the mirror on the mirror's lnct8w 2 c984)n gmt0-vx7cg z2jqq-ylm8ntm 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 i npf*gs d-a*j:) xxu1fmage is 4.7 cm tall, and 10 cm from the mirror. How tall is the object-fsfua *g *d:xj1p n)x?

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 a3t,f8agyc6q k6+kogigzcg*jw6 c l1 8nzn(c 3 concave mirror of focal length 20 cm. The object is 4.0 cm tall. How tal3n63c 16wc ya+6lt g zoq(g,nc *8fji8zk kggcl 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 cm talftx ;8ey o*1qll, and 14.8 cm from the mirror. How far is the object from tylf ;q 1tox*8ehe mirror?

A. $124 \; cm$

B. $47.6 \; cm$

C. $18.2 \; cm$

D. $12.0 \; cm$

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.4 cm tall object is 4.0 cm from a concave mirror. If the image is 43cqe h xv.xjnmdw fq3 5-1: jq1qf40p 6cc4jpq.0 cm tall, how far is it fpwc q 5mvqfpq.d41c1f cq:x6jjj0hn-3 xe3q4rom 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 stshw)n-x ,n3s3 m);s)awnj f cm from a concave mirror of focal length 20 cm. The object is 4.0 cm tall. Where is the image lowt3 )n;nxj-,ssa whn 3 )sfm)scated?

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 mirror), theor. lp3p v5+jo3yms5r erect image is twice the size of the object. What is the focal l v5 o.j3+rlr3opspym5ength 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 shavint*ty3o ),w9wwzyh: jzk o vg4,g mirror. If the image is an erect image 1.5 times as large as the ob yyw vtg,34kh:zjo9oz,wt)w* ject, what 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 concave mirror with focal length 5.0 cmp.xn7ejok ,r :. Where is the objnpr. joxk7 e,: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 of -20 cm. An object is place3qk, w1vho7ro,vj9ivm 7 o5w hd 10 cm in front of the mirror on the mirror's axis. Where is the image low7qv3vr 9wv5 ho1,mo,i j7 kohcated?

A. 20 cm behind the mirror

B. 20 cm in front of the mirror

C. 6.7 cm behind the mirror

D. 6.7 cm in front of the mirror

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex spherical mirror has a focal length of -20 cm. An object is place hdx(ihm5q cr;zq4ux;fn; 9j)d 30 cm in front of the mirror on thezmdu hx;4 jf ;q(5r)hqcx 9ni; 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 isv dj d/40obfpnx1fr64 5.8 cm behind the mirror. What is the focal length ojbrf 40 nx4vfd1opd6/ f 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 imkmugc 9*zb4;myl u 7b f,6po sho2p,o3age is 7.80 cm tall, and 14.8 cm from a convex mirror. What is the mirror's focal lengfhokcs*b,m ulbyop 3 29;mu4,pz7og6th?

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 refractionb2jz8bp,) h1 4cs;hzjvzph0q of 1.50, what is the speed of light thro;zp,jh1vj) 4cz0 h2pbz h8sbq ugh 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 i6mq8ngy p wxt)p9 1hv0)4 mqoju*5iccncident on an air 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 from air at an ai/9np/eh-g., cse v;x0e ;kkkqs ;vkpngle 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 incomindbf7 x y2gk0e(dkv; x9se;hs; g 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 8 (m-a;ibg gqny/o; uwsmoothly and evenly over the surface of water on a windless day. What is the ang 8gg/imy; qubw;(- noale 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 suv9adv,z ofn /2( 8(imql6y yofrface of a still pond of water. At what angle must the diver shine a beam of light toward the surface in order9filaq/dov( f6zm( o8,2vny y 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, t:/xq:s56dqlb)j d rzstrikes a plate of transparent material at an angle of)j6 z5:sddq:r t/qlxb 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 ildi2 mc(2)r8hbj+e fincident on a slab of transparent material. The incident beam and the refracted beam make anglhj i rm+)dl8eibc2f2(es 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 1a ,z-dte/qs0i.46. Light is passing through it at zi,- aeq0s/dt$53.0^{\circ}$. 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 fn2 h;st;nqc6s pa 33qfor light traveling from crown glass (n = 1.52) into water (n = 1.36ahfcs 3tp s 2;3q;nqn3)?

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 i+n yoml:jvq - p8f;/p+0o aimxs its critical angle of incidencmp/0 i o;fa+oq8m p +-:lyxnvje?

A. $11.6^{\circ}$

B. $15.4^{\circ}$

C. $41.8^{\circ}$

D. $87.4^{\circ}$

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101#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An optic fiber is made of clear plastic with i7/lqqn:tj.ls 9y awk.ndex of refraction of 1.50. For what angl.wj nka./ll9y7t qq:s e of incidence will light remain within the plastic "guide"?

A. $>23.4^{\circ}$

B. $>38.3^{\circ}$

C. $>40.3^{\circ}$

D. $>41.8^{\circ}$

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102#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The critical angle for a substance is measured at s*insw:ouk dq *k ;7wv5nq.l($57.3^{\circ}$. 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 frojw2pnaae2h +kto6 u 5 ,9vxi2cm 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 *sm:6v)fqm rddiameter of 20 mm. Its ends are perpendicular to its axis. Its index of refraction is 1.30. What is the maximum number of reflections a light rvm*qr6f): sm day 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 lgxk;myl1 64rfy, qgn.4wb9 p in front of a 20 cm focal length converging lens. How far is the im6q 4wg4y.; k ln9lgxprbfy1,mage 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- xfz* icr bv-cq0p-y) of a converging lens with focal length 4 cm. Where is they-vxz rf0cq*cp)-ib- 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 fq )a6gjsj/ yq*xhb.a rbxg. 9:ront of a converging lens, and the image is 4.0 mm behind the lexja *xhabsq9.qgb:/6y )r.j gns. What is the focal 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 ao9 ;2ciuv dnuuje94c9v 7( va4.0 mm tall, how far is it from the leneauvvo72uc 9ij94 uv d;n(ca9s?

A. $14 \; mm$

B. $8.7 \; mm$

C. $1.4 \; mm$

D. $1.1 \; mm$

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109#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When an object is 40 m in front of a converging lens the inverted image is ha tvb9 (gsli8.llf the size of the object. What is the focal lenbtgi. s llv89(gth 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 le/7t v sh 2 4vzh.hx3es-e;icdnns with focal length 5.0 mm. Where is the hshxvn4.- cvedets ;z i7h2/3object?

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 ioh7khenx46uze8i. 1,wfh4 l+ 4n kyugcgb*- lmage is virtual and 6.2 cm tall. Whatk yw-4+zgc1i ,lbg8.nn 6 u4oelhuh*4e7xh kf 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 cgq. 2 fl.huuz5pwjmda q v9:,1onverging lens. The image is 4.0 mm tall, and 9.0 cm from the len9q,l.: p5qdj2 ghzu1v mf auw.s. 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 fo v;l:(loqyf9m-r ar 1cijg39cn vyq 1zbm5/h1rms a real image. When the object is moved t9v-cflmzl b3(mi 1qr1q:o yv jya/h;c r51gn9o 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. ;g)u/s c9b6gf/6if tq r/frs d The lens has a focal length of 10 cm. What are the values, respectively,g dbsc/f//t 9iq urr66sgf;)f 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 divez) fs5r08- 1bw lkzcihrging lens with a focal length of 10 c zlwz 0cs)8kh1rf-bi5 m. 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 c .p3.ghn6ugcv7 7b6 r9)kqfo(y pa cmnm in front of a diverging lens with a focal length of 10 cm. What is t639fb cp6 vogm n)a( cg 7.pnqu7k.rhyhe 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 ihp- n4 :rsdb.xn front of a diverging lens. The image is 4.0 cm from the lens. How tall4- n.p hrdsx:b 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 diverg)-qcc7 ao vv6yu+fose;q5t23tl 6rgring lens. The image is 2.5 cm tall, and 7);+q5vryf qco -rct osa3vle6gt2 u67.5 cm from the lens. 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 fro alm/y5t myp0*gi4t(tm a thin lens. If a virtual image forms at a distance of 50 cm from the lens, on the same side as the object, what is the ftgm(*ytli0y/amt p 5 4ocal 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 br.knzon, jxcghts y7v6 gu7b,n* g./ +e placed if it is to form a 6*vnz7b 7 g,gryon,+tuxgjs hc.k . n/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 is2ymyu46vtqw ;m ngw33a a xhqr*,t47 q used in many 35-mm cameras, must*y ;qw36vwm4x ,agntyut2r q m47aqh3 an object 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 20 cm, are placebe nv81 +hb(k q.u0ejhd in contact. What is the focal length j 0 b n8qhv(b1hu.k+eeof 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 rad4lve7emo* i6jjjd8t; ii of curvature 46 cm, and is made of glass of index of refraction n = 1;6jl*tj 87e4jo dv mie.60. What is the focal length?

A. infinite

B. $38 \; cm$

C. $30 \; cm$

D. $18 \; cm$

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124#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A double convex lens made of glass (n = 1.50) hazs bnwm (22jxw:w:r;vgrsan,s 4 8sv4s a radius of 40 cm on the front side and 30 cm on the back side. What is the focal length ngjxwr::8ssv2b 4 ,;(w2 an4wrs mzv sof 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 pbu9y tiev0lq; :x8ye5)v:edsk 4 y6ug iece of plastic (n = 1.70). The radius of the front surface u )694 5kyd:veusge i x0lbyytqe :v;8is 20 cm and the radius of 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 lengy/jq iv -crdk)jq:x* )th of 40 cm. It is made of glass of inde:)djv)ri yk x-qq /cj*x 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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