Question 1

The objective lens of the Yerkes telescope (the largest functioning refracting telescope in the world) has a focal length of 19.4 m.If its eyepiece has a focal length of 2.5 cm, what is the magnitude of its magnification?

Accepted Answer

A)  7.8
B)  13
C)  130
D)  780
E)  cannot be calculated without knowing the length of the telescopeF) B) and C)
G) B) and D)

Question 2

Let fo and fe be the focal lengths of the objective and eyepiece of a compound microscope.In ordinary use, the object:

Accepted Answer

A)  is less than fo from the objective lens
B)  is more that fo from the objective
C)  produces an intermediate image which is slightly more than fe from the eyepiece
D)  produces an intermediate image which is 2fe away from the eyepiece
E)  produces an intermediate image which is less than fo from the objectiveF) A) and B)
G) A) and C)

Question 3

A concave refracting surface is one with a center of curvature:

Accepted Answer

A)  to the left of the surface
B)  to the right of the surface
C)  on the side of the incident light
D)  on the side of the refracted light
E)  on the side with the higher index of refractionF) B) and D)
G) A) and E)

Question 4

A hollow lens is made of thin glass as shown.It can be filled with air, water (n = 1.3) or CS2 (carbon disulfide, n = 1.6) .A beam of parallel light entering the lens will diverge if the lens is filled with: 2 (carbon disulfide, n = 1.6) .A beam of parallel light entering the lens will diverge if the lens is filled with:   A) air and immersed in air B) air and immersed in water C) water and immersed in CS2 D) CS2 and immersed in water E) CS2 and immersed in CS2" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  air and immersed in air
B)  air and immersed in water
C)  water and immersed in CS2
D)  CS2 and immersed in water
E)  CS2 and immersed in CS2F) A) and B)
G) A) and E)

Question 5

A concave spherical mirror has a focal length of 12 cm.If an object is placed 18 cm in front of it the image position is:

Accepted Answer

A)  7.2 cm behind the mirror
B)  7.2 cm in front of the mirror
C)  36 cm behind the mirror
D)  36 cm in front of the mirror
E)  at infinityF) B) and C)
G) None of the above

Question 6

An object is 30 cm in front of a converging lens of focal length 10 cm.The image is:

Accepted Answer

A)  real and larger than the object
B)  real and the same size than the object
C)  real and smaller than the object
D)  virtual and the same size than the object
E)  virtual and smaller than the objectF) B) and C)
G) A) and E)

Question 7

A 5.0-ft woman wishes to see a full length image of herself in a plane mirror.The minimum length mirror required is:

Accepted Answer

A)  2.5 ft
B)  3.54 ft
C)  5.0 ft
D)  10 ft
E)  no single answer: the farther away she stands the smaller the required mirror lengthF) All of the above
G) B) and E)

Question 8

A converging lens of focal length 20 cm is placed in contact with, and to the left of, a diverging lens of focal length 30 cm.If an object is placed 40 cm to the left of the converging lens, the total magnification is:

Accepted Answer

A)  -3.0
B)  -1.5
C)  -1.0
D)  2.0
E)  3.0F) B) and E)
G) A) and B)

Question 9

A man holds a rectangular card in front of and parallel to a plane mirror.In order for him to see the entire image of the card, the least mirror area needed is:

Accepted Answer

A)  that of the whole mirror, regardless of its size
B)  that of the pupil of his eye
C)  one-half that of the card
D)  one-fourth that of the card
E)  an amount which decreases with his distance from the mirrorF) B) and D)
G) A) and C)

Question 10

An object is 20 cm to the left of a lens of focal length +10 cm.A second lens, of focal length +12.5 cm, is 30 cm to the right of the first lens.The distance between the original object and the final image is:

Accepted Answer

A)  0 cm
B)  28 cm
C)  50 cm
D)  100 cm
E)  infiniteF) C) and E)
G) A) and C)

Question 11

Consider the following four statements concerning a compound microscope:  Which two of the four statements are correct?

Accepted Answer

A)  I, II
B)  I, III
C)  I, IV
D)  II, III
E)  II, IVF) C) and E)
G) B) and D)

Question 12

An object is in front of a converging lens, at a distance less than the focal length from the lens.Its image is:

Accepted Answer

A)  virtual and larger than the object
B)  real and smaller than the object
C)  virtual and smaller than the object
D)  real and larger than the object
E)  virtual and the same size as the objectF) A) and E)
G) B) and C)

Question 13

A converging lens is symmetric; its curved sides have radii of 50 cm.If the focal length is to be 80 cm, what should the index of refraction be?

Accepted Answer

A)  0
B)  0.3
C)  0.6
D)  1.3
E)  1.6F) None of the above
G) A) and B)

Question 14

A card marked IAHIO8 is standing upright in front of a plane mirror.Which of the following is NOT true?

Accepted Answer

A)  The image is virtual
B)  The image shifts its position as the observer shifts his position
C)  The image appears as 8OIHAI to a person looking in the mirror
D)  The image is caused mostly by specular rather than diffuse reflection
E)  The image is the same size as the objectF) A) and D)
G) A) and E)

Question 15

Where must an object be placed in front of a converging lens in order to obtain a virtual image?

Accepted Answer

A)  At the focal point
B)  At twice the distance to the focal point
C)  Anywhere beyond the focal point
D)  Between the focal point and the lens
E)  Between the focal point and twice the distance to the focal pointF) B) and E)
G) A) and D)

Question 16

At what distance in front of a concave mirror must an object be placed so that the image and object are the same size?

Accepted Answer

A)  one focal length
B)  half the focal length
C)  twice the focal length
D)  less than half the focal length
E)  more than twice the focal lengthF) A) and B)
G) C) and D)

Question 17

When you stand in front of a plane mirror, your image is:

Accepted Answer

A)  real, erect, and smaller than you
B)  real, erect, and the same size as you
C)  virtual, erect, and smaller than you
D)  virtual, erect, and the same size as you
E)  real, inverted, and the same size as youF) A) and B)
G) A) and C)

Question 18

The term "virtual" as applied to an image made by a mirror means that the image:

Accepted Answer

A)  is on the mirror surface
B)  cannot be photographed by a camera
C)  is in front of the mirror
D)  is the same size as the object
E)  cannot be shown directly on a screenF) D) and E)
G) B) and D)

Question 19

In a two lens microscope, the intermediate image is:

Accepted Answer

A)  virtual, erect and magnified
B)  real, erect and magnified
C)  real, inverted and magnified
D)  virtual, inverted and reduced
E)  virtual, inverted and magnifiedF) B) and C)
G) B) and E)

Question 20

A magnifying glass has a focal length of 15 cm.If the near point of the eye is 25 cm from the eye the angular magnification of the glass is about:

Accepted Answer

A)  0.067
B)  0.33
C)  0.5
D)  0.67
E)  1.7F) A) and D)
G) D) and E)

Exam 34: Images

A concave refracting surface is one with a center of curvature:

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Where must an object be placed in front of a converging lens in order to obtain a virtual image?

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A hollow lens is made of thin glass as shown.It can be filled with air, water (n = 1.3) or CS2 (carbon disulfide, n = 1.6) .A beam of parallel light entering the lens will diverge if the lens is filled with:

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A 5.0-ft woman wishes to see a full length image of herself in a plane mirror.The minimum length mirror required is:

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A converging lens is symmetric; its curved sides have radii of 50 cm.If the focal length is to be 80 cm, what should the index of refraction be?

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A magnifying glass has a focal length of 15 cm.If the near point of the eye is 25 cm from the eye the angular magnification of the glass is about:

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Consider the following four statements concerning a compound microscope: Which two of the four statements are correct?

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Let fo and fe be the focal lengths of the objective and eyepiece of a compound microscope.In ordinary use, the object:

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A card marked IAHIO8 is standing upright in front of a plane mirror.Which of the following is NOT true?

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When you stand in front of a plane mirror, your image is:

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An object is 20 cm to the left of a lens of focal length +10 cm.A second lens, of focal length +12.5 cm, is 30 cm to the right of the first lens.The distance between the original object and the final image is:

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A concave spherical mirror has a focal length of 12 cm.If an object is placed 18 cm in front of it the image position is:

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A man holds a rectangular card in front of and parallel to a plane mirror.In order for him to see the entire image of the card, the least mirror area needed is:

Correct AnswerverifiedShow Answer

The term "virtual" as applied to an image made by a mirror means that the image:

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At what distance in front of a concave mirror must an object be placed so that the image and object are the same size?

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The objective lens of the Yerkes telescope (the largest functioning refracting telescope in the world) has a focal length of 19.4 m.If its eyepiece has a focal length of 2.5 cm, what is the magnitude of its magnification?

Correct AnswerverifiedShow Answer

An object is 30 cm in front of a converging lens of focal length 10 cm.The image is:

Correct AnswerverifiedShow Answer

A converging lens of focal length 20 cm is placed in contact with, and to the left of, a diverging lens of focal length 30 cm.If an object is placed 40 cm to the left of the converging lens, the total magnification is:

Correct AnswerverifiedShow Answer

In a two lens microscope, the intermediate image is:

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An object is in front of a converging lens, at a distance less than the focal length from the lens.Its image is:

Correct AnswerverifiedShow Answer

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A hollow lens is made of thin glass as shown.It can be filled with air, water (n = 1.3) or CS₂ (carbon disulfide, n = 1.6) .A beam of parallel light entering the lens will diverge if the lens is filled with:

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Let f_o and f_e be the focal lengths of the objective and eyepiece of a compound microscope.In ordinary use, the object:

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