Question 1

A diverging lens will be prescribed by the eye doctor to correct which of the following?

Accepted Answer

A)  myopia
B)  presbyopia
C)  hyperopia
D)  astigmatismE) A) and C)
F) A) and D)

Question 2

The 2.4-m diameter Hubble space telescope has been placed into Earth orbit by the space shuttle.Assuming a wavelength of 653 nm, what angular resolution could this telescope achieve by Rayleigh's criterion? (1 nm = 10-9 m)

Accepted Answer

A)  3.7 * 10-6 rad
B)  4.5 * 10-6 rad
C)  2.7 * 10-6 rad
D)  3.3 * 10-7 radE) A) and D)
F) A) and B)

Question 3

Doubling the focal length of the objective lens of a compound microscope will change the magnification by what factor?

Accepted Answer

A)  1/4
B)  1/2
C)  2
D)  4E) B) and C)
F) A) and D)

Question 4

A 1.6-m tall woman stands 7.0-m in front of a camera with a 6.0-cm focal length lens.What is the size of the image formed on film?

Accepted Answer

A)  26.3 cm
B)  1.9 cm
C)  1.4 cm
D)  67.2 cmE) All of the above
F) A) and B)

Question 5

A compound microscope has an eyepiece that:

Accepted Answer

A)  uses a real image from the objective as the object and forms its own real image.
B)  uses a real image from the objective as the object and forms a virtual image.
C)  uses a virtual image from the objective as the object and forms its own real image.
D)  uses a virtual image from the objective as the object and forms its own virtual image.E) C) and D)
F) B) and D)

Question 6

If a person is farsighted the corrective lens will:

Accepted Answer

A)  take an object at the near point and form an image at 25 cm.
B)  take an object at 25 cm and form an image at the near point.
C)  take an object at infinity and form an image at 25 cm.
D)  take an object at infinity and form an image at the near point.E) None of the above
F) All of the above

Question 7

Why is it easier to see fine print in brighter light than in dimmer light?

Accepted Answer

A)  This is not so, it is easier to see fine print in dimmer light than in brighter light.
B)  Because the power (in diopters)  of the eye increases as the light intensity increases.
C)  In brighter light, the longer wavelengths dominate.
D)  In brighter light, the f-number of the eye increases.E) All of the above
F) C) and D)

Question 8

An astronomical telescope has an objective lens with focal length fo and has an eyepiece with focal length fe.A second telescope has objective and eyepiece lenses with triple the focal length of the first telescope.Which telescope gives the greater magnification and by what factor?

Accepted Answer

A)  The first telescope gives 9 times the magnification of the second.
B)  The second telescope gives 9 times the magnification of the first.
C)  Both telescopes give the same magnification.
D)  The actual focal lengths must be known to answer this question.E) A) and C)
F) All of the above

Question 9

How many lines in a grating must be illuminated to obtain a resolving power of 300 in a third-order spectrum?

Accepted Answer

A)  900
B)  100
C)  300
D)  10E) A) and C)
F) A) and B)

Question 10

A simple magnifier makes an image appear at the near point distance from the eye of the viewer (25 cm) .What is the magnifying power of the magnifier if it is constructed of a lens of focal length of 5.0 cm?

Accepted Answer

A)  1.2
B)  5.0
C)  6.0
D)  63E) B) and C)
F) C) and D)

Question 11

A person can see well in the distance, but cannot do so at an arm's-length distance.To correct this, lenses that are ________ having a ________ power could be used.

Accepted Answer

A)  thicker at their center than at the edges, positive
B)  thicker at their center than at the edges, negative
C)  thinner at their center than at the edges, positive
D)  thinner at their center than at the edges, negativeE) A) and C)
F) None of the above

Question 12

Find the radius of a star image formed on the retina of the eye if the aperture diameter (the pupil)  at night is 0.70 cm and the length of the eye is 3.1 cm.Assume the wavelength of starlight in the eye is 500 nm.(1 nm = 10-9 m)

Accepted Answer

A)  2.7 * 10-4 m
B)  5.4 * 10-4 m
C)  3.1 * 10-5 m
D)  2.7 * 10-6 mE) All of the above
F) A) and B)

Question 13

While a camera has film where the image is formed, the eye forms the image on the:

Accepted Answer

A)  pupil.
B)  cornea.
C)  retina.
D)  optic nerve.E) B) and D)
F) B) and C)

Question 14

The pupil of the eye increases in size under which condition?

Accepted Answer

A)  eye is focused on a distant object
B)  eye is focused on a nearby object
C)  object viewed is dimly illuminated
D)  object viewed is well illuminatedE) A) and C)
F) B) and D)

Question 15

Changing the f-number of a camera by three stops by going from f/5.6 to f/16 will change the intensity of the light hitting the film by a factor of:

Accepted Answer

A)  8.
B)  4.
C)  1/4.
D)  1/8.E) A) and D)
F) B) and C)

Question 16

A lens with focal length 5.0 cm is used as a magnifying glass.To obtain maximum magnification, how far in front of the lens should the object be placed?

Accepted Answer

A)  5.0 cm
B)  4.2 cm
C)  10 cm
D)  25 cmE) A) and B)
F) None of the above

Question 17

In the normal eye the ciliary muscles that control the lens will relax:

Accepted Answer

A)  when viewing objects at the near point.
B)  when viewing objects at infinity.
C)  when viewing objects at a distance of 20 ft.
D)  only when a person has his/her eyes closed.E) All of the above
F) B) and C)

Question 18

Two thin lenses have powers P1 and P2, measured in diopters. If these lenses are placed in contact with one another, the resulting power is:

Accepted Answer

A)  more than both P1 and P2.
B)  less than both P1 and P2.
C)  half-way between P1 and P2.
D)  P1 + P2.E) A) and B)
F) A) and C)

Question 19

A magnifying lens of power d (in diopters)  gives what magnification when the viewing eye is relaxed assuming a near point of 25 cm?

Accepted Answer

A)  25d
B)  0.25/d
C)  d/4
D)  The correct answer is not given.E) A) and B)
F) None of the above

Question 20

A camera lens is initially set at f/32 for a shutter speed of 1/15 s.If the amount of lighting on the subject is unchanged, and the lens is set at f/16, what is the proper shutter speed at this setting?

Accepted Answer

A)  1/60 s
B)  1/2 s
C)  1/125 s
D)  1/30 sE) A) and C)
F) B) and D)

Exam 25: Optical Instruments

A lens with focal length 5.0 cm is used as a magnifying glass.To obtain maximum magnification, how far in front of the lens should the object be placed?

Correct AnswerverifiedShow Answer

A 1.6-m tall woman stands 7.0-m in front of a camera with a 6.0-cm focal length lens.What is the size of the image formed on film?

Correct AnswerverifiedShow Answer

The pupil of the eye increases in size under which condition?

Correct AnswerverifiedShow Answer

A simple magnifier makes an image appear at the near point distance from the eye of the viewer (25 cm) .What is the magnifying power of the magnifier if it is constructed of a lens of focal length of 5.0 cm?

Correct AnswerverifiedShow Answer

A person can see well in the distance, but cannot do so at an arm's-length distance.To correct this, lenses that are ________ having a ________ power could be used.

Correct AnswerverifiedShow Answer

A compound microscope has an eyepiece that:

Correct AnswerverifiedShow Answer

How many lines in a grating must be illuminated to obtain a resolving power of 300 in a third-order spectrum?

Correct AnswerverifiedShow Answer

A magnifying lens of power d (in diopters) gives what magnification when the viewing eye is relaxed assuming a near point of 25 cm?

Correct AnswerverifiedShow Answer

While a camera has film where the image is formed, the eye forms the image on the:

Correct AnswerverifiedShow Answer

Doubling the focal length of the objective lens of a compound microscope will change the magnification by what factor?

Correct AnswerverifiedShow Answer

A camera lens is initially set at f/32 for a shutter speed of 1/15 s.If the amount of lighting on the subject is unchanged, and the lens is set at f/16, what is the proper shutter speed at this setting?

Correct AnswerverifiedShow Answer

The 2.4-m diameter Hubble space telescope has been placed into Earth orbit by the space shuttle.Assuming a wavelength of 653 nm, what angular resolution could this telescope achieve by Rayleigh's criterion? (1 nm = 10-9 m)

Correct AnswerverifiedShow Answer

Why is it easier to see fine print in brighter light than in dimmer light?

Correct AnswerverifiedShow Answer

In the normal eye the ciliary muscles that control the lens will relax:

Correct AnswerverifiedShow Answer

If a person is farsighted the corrective lens will:

Correct AnswerverifiedShow Answer

Changing the f-number of a camera by three stops by going from f/5.6 to f/16 will change the intensity of the light hitting the film by a factor of:

Correct AnswerverifiedShow Answer

Two thin lenses have powers P1 and P2, measured in diopters. If these lenses are placed in contact with one another, the resulting power is:

Correct AnswerverifiedShow Answer

Find the radius of a star image formed on the retina of the eye if the aperture diameter (the pupil) at night is 0.70 cm and the length of the eye is 3.1 cm.Assume the wavelength of starlight in the eye is 500 nm.(1 nm = 10-9 m)

Correct AnswerverifiedShow Answer

An astronomical telescope has an objective lens with focal length fo and has an eyepiece with focal length fe.A second telescope has objective and eyepiece lenses with triple the focal length of the first telescope.Which telescope gives the greater magnification and by what factor?

Correct AnswerverifiedShow Answer

A diverging lens will be prescribed by the eye doctor to correct which of the following?

Correct AnswerverifiedShow Answer

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Correct Answer
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A person can see well in the distance, but cannot do so at an arm's-length distance.To correct this, lenses that are having a power could be used.

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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The 2.4-m diameter Hubble space telescope has been placed into Earth orbit by the space shuttle.Assuming a wavelength of 653 nm, what angular resolution could this telescope achieve by Rayleigh's criterion? (1 nm = 10^-9m)

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Two thin lenses have powers P₁ and P₂, measured in diopters. If these lenses are placed in contact with one another, the resulting power is:

Correct Answer
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Find the radius of a star image formed on the retina of the eye if the aperture diameter (the pupil) at night is 0.70 cm and the length of the eye is 3.1 cm.Assume the wavelength of starlight in the eye is 500 nm.(1 nm = 10^-9m)

Correct Answer
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An astronomical telescope has an objective lens with focal length f_o and has an eyepiece with focal length f_e.A second telescope has objective and eyepiece lenses with triple the focal length of the first telescope.Which telescope gives the greater magnification and by what factor?

Correct Answer
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Correct Answer
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