Physics Unit25: Optical Instrument

1#

The length of time the shutter is open and the film is exposed in1 bk0z0a v+;qjh+tfsa3 yu 5u2l(jlbb a camera is determineb0 lt+az0;y21+sf( hqjj5a ubk3bvlu d by the (1.0 分)

A. shutter speed.

B. f-stop.

C. focusing.

D. none of the given answers

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2#

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The amount of light reaching the film in . bmxq7a0e)j+vw n+p 72fmgg1bbrg 2ua camera is determined by the (1.0 分)

A. shutter speed.

B. f-stop.

C. focusing.

D. none of the given answers

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3#

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In a single-lens reflex camera the lens-film distance mo-ens 7ai/e8yues;:x ay be varied by sliding the lens forward or backward with respect to the camera housing. If, with such a camera, a fuzzy : /ussxao8ye7n e e-;ipicture is obtained, this means that (1.0 分)

A. the lens was too far from the film.

B. the lens was too close to the film.

C. too much light was incident on the film.

D. too little light was incident on the film.

E. none of the given answers

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4#

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A camera lens that covers the film with a field of view that corresponds apwir,h y31ve )0ptvbza2u;. k,h0o r gpproximately to that of normal ve2uh, hz ;ogra0kpiy ,rpb.t13 v0)vwision is referred to as a (1.0 分)

A. normal lens.

B. telephoto lens.

C. wide-angle lens.

D. zoom lens.

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5#

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A camera lens that acts like qr3s.d2kvd9k v :y+ztjkjnd))8vkt( a telescope to magnify images is referred to as a (1.0 分)

A. normal lens.

B. telephoto lens.

C. wide-angle lens.

D. zoom lens.

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6#

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A camera lens that covers the film with 0 (vl-ep( u/rmdetyt5a wider field of view than that of the eye and through which objects appear smaller is referred to a (t (ved/5u0 rme-tlyps a (1.0 分)

A. normal lens.

B. telephoto lens.

C. wide-angle lens.

D. zoom lens.

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7#

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In which of the following ways is a cameriffzc l*1t:dp3qt8kf + ;/ltra different from the human eye? (1.0 分)

A. The camera always forms an inverted image, the eye does not.

B. The camera always forms a real image, the eye does not.

C. The camera utilizes a fixed focal length lens, the eye does not.

D. For the camera, the image magnification is greater than one, but for the eye the magnification is less than one.

E. A camera cannot focus on objects at infinity but the eye can.

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8#

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The principal refraction of light by the eye occurs a95ffo9m xzu s1t the (1.0 分)

A. cornea.

B. lens.

C. retina.

D. iris.

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9#

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The closest distance at which an eye can see objects clearly is3(mo t +*zq1 mh5/o ,jao))qbd q ao,hdqxdp5t (1.0 分)

A. the near point.

B. the far point.

C. nearsightedness.

D. farsightedness.

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10#

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The farthest distance at which ans yf f6,+nid0f eye can see objects clearly is (1.0 分)

A. the near point.

B. the far point.

C. nearsightedness.

D. farsightedness.

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11#

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If a person's eyeball is too long from front to backkop+yzhd0,/ykp2 ;.je e nnh+, the person is likely to suffer fropphz+nk/heo.yd,nyj 2;+k e0m (1.0 分)

A. spherical aberration.

B. nearsightedness.

C. farsightedness.

D. astigmatism.

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12#

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Nearsightedness can usually be corrected wit,sxtz7* kt25r ;am p +r-tuso8ev8jdhh (1.0 分)

A. converging lenses.

B. diverging lenses.

C. achromatic lenses.

D. cylindrical lenses.

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13#

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If the human eyeball is5e(q 2/:lsp 3z df,jqaaigjq2 too long from front to back, this gives rise to a vision defect that can be corrected by usingg2sjzf l/:qqda3 ja 25e(qp,i (1.0 分)

A. convex meniscus eyeglasses.

B. concave meniscus eyeglasses.

C. cylindrical eyeglasses.

D. contact lenses, but no ordinary lenses.

E. shaded glasses (i.e., something that will cause the iris to dilate more).

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14#

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If a person's eyeball is too short from front tof y*4wx pv;l/nejo+me1z/ag) back, the person is likely to suffx + pze1wam4yef)g j;/*ovn/ ler from (1.0 分)

A. astigmatism.

B. spherical aberration.

C. farsightedness.

D. nearsightedness.

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15#

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Farsightedness can usually bfd. ;fw8vzwsjf mfg,)-b;qp+ ) ss9 cxe corrected with (1.0 分)

A. cylindrical lenses.

B. achromatic lenses.

C. diverging lenses.

D. converging lenses.

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16#

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If the human eyeball is too short fro/ac7 y2zg+h.* lv i8ot6egmr1l5vo cmm front to back, this gives rise to a vision defect that can be corrected by m7r gv/6c+ .y8ecvhi gol2l1 z*m5toausing (1.0 分)

A. convex meniscus eyeglasses.

B. concave meniscus eyeglasses.

C. cylindrical eyeglasses.

D. contact lenses, but no ordinary lenses.

E. shaded glasses (i.e., something that will cause the iris to dilate more).

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17#

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What type of lens is a magnifying caewsq-7,,emvilze i 0 u9y3 :glass? (1.0 分)

A. converging

B. diverging

C. spherical

D. cylindrical

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18#

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An important reason for using a very large digpmw.0l g bsj8 hq2w:3ameter objective in an astronomical telescope igws. wl 8p:g 03hmjqb2s (1.0 分)

A. to increase the magnification.

B. to increase the resolution.

C. to form a virtual image, which is easier to look at.

D. to increase the width of the field of view.

E. to increase the depth of the field of view.

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19#

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Consider the image formed by amu wjzo+9 k.3z refracting telescope. Suppose an opaque screen is placed in front of the lower half of the objective lens. What effect wizu 3mo.+wk 9zjll this have? (1.0 分)

A. The top half of the image will be blacked out.

B. The lower half of the image will be blacked out.

C. The entire image will be blacked out, since the entire lens is needed to form an image.

D. The image will appear as it would if the objective were not blocked, but it will be dimmer.

E. There will be no noticeable difference in the appearance of the image with the objective partially blocked or not.

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20#

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Assuming the film used has uc3s sszx26u6 hniform sensitivity throughout the visible spectrum, in which of the following cases would you be able to best distinguish between two cl6 x23hcs6 suszosely spaced stars? (The lens referred to is the objective lens of the telescope used.) (1.0 分)

A. use a large lens and blue light

B. use a large lens and red light

C. use a small lens and blue light

D. use a small lens and red light

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21#

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A refracting telescope has a:txl;hmzu22pe x4 x svg x0m54 magnification $m$. If the objective focal length is doubled and the eyepiece focal length is halved, what is the new magnification? (1.0 分)

A. $4 \; m$

B. $2 \; m$

C. $m/2$

D. $m/4$

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22#

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With what color light would you expect to be able to see tp l x;/b.7d)u*m zmsndhe greatest detail when using a micd b./mumz ) ps7*dx;lnroscope? (1.0 分)

A. red, because of its long wavelength

B. yellow, because of its right wavelength

C. blue, because of its shorter wavelength

D. Color does not matter.

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23#

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Spherical lenses suffepw ra(xn 4b u;jl7*ud(r from (1.0 分)

A. both spherical and chromatic aberration.

B. spherical aberration, but not chromatic aberration.

C. chromatic aberration, but not spherical aberration.

D. neither spherical nor chromatic aberration.

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24#

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Spherical mirrors suffer fron3c8 44s azfinm (1.0 分)

A. both spherical and chromatic aberration.

B. spherical aberration, but not chromatic aberration.

C. chromatic aberration, but not spherical aberration.

D. neither spherical nor chromatic aberration.

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25#

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The resolving power of a micret uli 4zr)xyi:b+2,a oscope refers to the ability to (1.0 分)

A. distinguish objects of different colors.

B. form clear images of two points that are very close together.

C. form a very large image.

D. form a very bright image.

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26#

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If the diameter of a radar dish is doubled, what happens to its re8pcjs3w s 6byqj4mh*s0e :; insolving power assuming that all other factors remain unc86nspjcms3q4 b i:* sy;ej0hwhanged? Its resolving power (1.0 分)

A. quadruples.

B. doubles.

C. halves.

D. is reduced to one-quarter its original value.

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27#

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A near-sighted person has a far point of 18 cm. What lens (in diopters) /j ;2xls 5dwc f9k0w ewc8xtykh8yz;7will allow this person to see distant objj2c7xc kw x;8syhtw 5w9z;fl/d0 8ykeects clearly? (1.0 分)

A. +5.6 D

B. -5.6 D

C. +0.056 D

D. -0.056 D

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28#

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A person cannot see clearly objects more than 70.0 cm away. What power of7j9(4y tkbjhdyvv m,iu7k (+f lens should be prescribed if the glass is to be worn 1.00 cm t+ 7y,yiv9bu vf 4(jk(jhdm 7kin front of the eye? (1.0 分)

A. $1.45 \; D$

B. $-1.45 \; D$

C. $0.0145 \; D$

D. $-0.0145 \; D$

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29#

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A nearsighted person we4 6 dsze ,*bicipimy,syd2x(9ars glasses whose lenses have power of -0.15 D. What is the person's far point if the glasses ares9y 6(czyb *,demps42,xi iid very close to the eyes? (1.0 分)

A. $1.5 \; m$

B. $3.3 \; m$

C. $6.0 \; m$

D. $6.7 \; m$

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30#

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What power lens is needed to correct for farsightedness where the unco3sakl+ a*dn: .dlww;srrected near point is 75 c 3k+ w;llwdna.d sa*s:m? (1.0 分)

A. +2.7 D

B. -2.7 D

C. +5.3 D

D. -5.3 D

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31#

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The near point of a farsiglii5a0i3iw f/(t ytr/28kq m thted person is 100 cm. She places reading glasses close to her eyes, and with them she can comfortabi3tf /t2k wta/rilq08(m5i iyly read a newspaper at a distance of 25 cm. What lens power is required? (1.0 分)

A. +2.5 D

B. +3.0 D

C. +3.2 D

D. -2.0 D

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32#

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A farsighted person can read a newspaper held 25 cm from his eyes, if hedjx-x;wtw n;61r.zi-u v* ukh wears glas-vxku1 .nhti;x;d6* wz- jurwses of
+3.33 diopters. What is this person's near point? (1.0 分)

A. $4.2 \; cm$

B. $25 \; cm$

C. $31 \; cm$

D. $1.5 \; m$

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33#

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A magnifying lens has a focal length of 10 cm. A person haso+ lbz j5;:4 2mwjxoqmk6ab k2 a near point of 25 cm. What is the magnification of the lens for that person whkz2:+owb64xaj;bkm 2loqj m5en their eyes are focused at infinity? (1.0 分)

A. 1.5

B. 2.5

C. 3.5

D. 4.5

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34#

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A magnifying lens has a focal length ok u/-9 (ekhgcdf 10 cm. A person has a near point of 25 cm. Wh gcduh ek/-9(kat is the magnification of the lens for that person when their eyes are focused at their near point? (1.0 分)

A. 1.5

B. 2.5

C. 3.5

D. 4.5

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35#

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A magnifying glass has a focal length of7usi 5zqziy4 8 naclx 1toc):9 7.0 cm. What is the magnification if the image isz ca 8c)ls5ou:iyx14qt7ni 9 z viewed by a relaxed eye? (1.0 分)

A. 1.6

B. 2.6

C. 3.6

D. 4.6

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36#

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A person uses a converginvu77 ijppor9* g lens of focal length 5.0 cm as a magnifying glass. What is the maxim*7p9vrpij7u o um possible magnification? (1.0 分)

A. 4.0

B. 5.0

C. 6.0

D. 7.0

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37#

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A person uses a converging lens of focal length 5.0 cm as a magnifying gla5vp: y ) iy3(yq+exv (tauf0ao6 bpw0zss. What is thev( yiztva6(bpa 0oyup3) eqxfw0y:+5 magnification if the person's eye is relaxed? (1.0 分)

A. 4.0

B. 5.0

C. 6.0

D. 7.0

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38#

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You have available lenses of focal lengths 2.0 cm, 4.0 cm, 8.0 cm, and 16.03mohs b z/;*q ktpa2)h cm. If you were to use any two of these lenses to build a telescope, what is the maximum magnificatioh p ;kot32zabh*sqm /)n you could achieve? (1.0 分)

A. 2.0

B. 4.0

C. 6.0

D. 8.0

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39#

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You have available lenses of focal lengths 2.0 cm, 4.0 cm, 8.0 cm, and 16 cm. h j/u9;zqcp bw08stnl38fwk+ If you were to use any two of these lenses to build a telescope, what is the lens separation for the +puwth;fw/k zb 8 0js l9cnq38maximum magnification telescope? (1.0 分)

A. $10.0 \; cm$

B. $12.0 \; cm$

C. $18.0 \; cm$

D. $24.0 \; cm$

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40#

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The objective of a telescope has a focal length of 200 cm ant8zi2xq2 jtz- d its eyepiece has a focal lengizx t- jt2z82qth of
1.1 cm. What is the magnification of this telescope when viewing an object at infinity? (1.0 分)

A. 20

B. 0.0050

C. 200

D. none of the given answers

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41#

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A student constructs an astronomical telescope w zwmuc1-df,c( ith a magnification of 10. If the telescope has a converging lens of focal lengcdu- fwcm1 z,(th 50 cm, what is the focal length of the eyepiece? (1.0 分)

A. $2.5 \; cm$

B. $5.0 \; cm$

C. $10 \; cm$

D. $25 \; cm$

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42#

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A student constructs an astronomical telescope with au9ig)nq3rang1e+l)jb ni ++ v magnification of 10. If the telescope+)b l 1+aunn 3vni gg+q)ri9je has a converging lens of focal length 50 cm, what is the resulting length of the telescope? (1.0 分)

A. $53 \; cm$

B. $55 \; cm$

C. $60 \; cm$

D. $75 \; cm$

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43#

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A person is designing a 10X telescope. Ifi t5bn*0fpgd, the telescope is limited to a length of 20 cmtib0,g *nfp5 d, what is the approximate focal length of the objective? (1.0 分)

A. $16 \; cm$

B. $17 \; cm$

C. $18 \; cm$

D. $19 \; cm$

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44#

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A microscope has an objective lens of focal length 1.4 mm and an eyepiece okmp19k0d1vgg f fockk01 9g vgpdm1al length 20 mm, adjusted for minimum eyestrain. A blood sample is placed 1.5 mm from the objective. How far apart are the lenses? (1.0 分)

A. $20 \; mm$

B. $21 \; mm$

C. $23 \; mm$

D. $41 \; mm$

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45#

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A microscope has an objectiv ib*cigln9m *x6v, 4jwe lens of focal length 1.4 mm and an eyepiece of focal length 20 mm, adjusted for minimum eyestrain. A blood sample is placed 1.5 mig w*ij,vb l 46n9*cxmm from the objective. What is the overall magnification? (1.0 分)

A. 18

B. 37

C. 180

D. 370

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46#

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A compound microscop3w zb8u2kwz/ ue has an objective with a focal length of 3.00 mm and an eyepiece of focal length 6.00 cm./ub u zz8wwk23 If the two lenses are separated by 40.0 cm, what is the total magnification? (1.0 分)

A. 27.8

B. 55.6

C. 278

D. 556

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47#

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A compound microscope has a 18-cm barrel and an objective with a f7h kc9f4ju5sodino;:ocal length of 8.0 mm. What is the focal length of the eyepkn :47 io5ohs9 jcduf;iece to give a total magnification of 240? (1.0 分)

A. $0.13 \; cm$

B. $1.5 \; cm$

C. $1.9 \; cm$

D. $2.3 \; cm$

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48#

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A binary star system in the constellat:4. ga8+wpr7/ ctjc ifsu c82yyvj0zbion Orion has an angular separation of 10-5 cjuy8vzg p 2+wabist.c4 08yj7r:c/frad. If the wavelength of the light from the system is 500 nm, what is the smallest aperture (diameter) telescope that can just resolve the two stars? (1.0 分)

A. $0.50 \; cm$

B. $0.61 \; cm$

C. $5.0 \; cm$

D. $6.1 \; cm$

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49#

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A compound microscope is designed to resolve objects wha(xmi7fa /2egrcekq1 p25 1d-sgf9tj ich are 0.010 mm apart. If the focal length of the objective is 4.0 cm and the wavelength of light used is 550 nmat92e pd5 2xgffq rj1/(e 1ics-7mkg a, what is the diameter of the objective? (1.0 分)

A. $0.27 \; mm$

B. $0.54 \; mm$

C. $2.7 \; mm$

D. $5.4 \; mm$

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50#

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The pupil of a person's eye changes from a diameter of 3.5 mnh id6 yv,3c4vnhx .yoq*rxx lpv:(lwkx4) )9m to 1.5 mm as the illumination is qr c po(n4vxyn 6)h*,)hi 94v3 yl.: wdxxvxklincreased. By what factor does the minimum angle of resolution change? (1.0 分)

A. 0.43

B. 0.65

C. 2.0

D. 2.3

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51#

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The 2.4-m reflecting Hubble Spacewma6sqzc,e(;t 2kqlq 7ed8g 7 Telescope has been placed into Earth orbit by the space shuttle. What angular resolution could this telescope achieveaqd q6mg;l 8s7c(te q, ek7w2z if the wavelength is 500 nm? (1.0 分)

A. $2.5 \times 10^{-7} \; rad$

B. $3.6 \times 10^{-7} \; rad$

C. $5.7 \times 10^{-7} \; rad$

D. $6.8 \times 10^{-7} \; rad$

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