Exam 27: Optical Instruments

An objective lens of a telescope has a 1.90 m focal length. When viewed through this telescope, the moon appears 5.25 times larger than normal. How far apart are the objective lens and the eyepiece when this instrument is focused on the moon?

(Short Answer)

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Question 21

Which one of the following is true regarding spherical aberration?

(Multiple Choice)

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Question 22

You have a choice between two lenses of focal lengths f_a and f_b = 2 f_a to use as objective lens in building a refracting telescope. If the magnification you obtain using lens A is M_a, what will be the magnification when using lens B?

(Multiple Choice)

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Question 23

A camera lens has a focal length of 50.0 mm and an aperture setting of 4.00. What is the aperture diameter of this lens?

(Multiple Choice)

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Question 24

What is the focal length of the corrective contact lens needed by a nearsighted person whose far point is 60 cm?

(Multiple Choice)

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Question 25

The lens in a person's eye is too thick. The condition that this person has is called

(Multiple Choice)

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Question 26

The power of a lens is 4.0 diopters. What is the focal length of this lens?

(Multiple Choice)

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Question 27

The focal length of the lens of a simple camera is 40.0 mm. How far must the lens be moved to change the focus of the camera from a person 25 m away to one that is 4.0 m away?

(Multiple Choice)

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Question 28

A person with a longer near point can see an object as closely with the unaided eye as can a person with the shorter near point.

(True/False)

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Question 29

A magnifying glass uses a converging lens with a refractive power of 20 diopters. What is the magnification if the image is to be viewed by a relaxed eye with a near point of 25 cm?

(Multiple Choice)

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Question 30

A terrestrial telescope has focal lengths of 15. mm, 7.5 cm, and 120. cm for eyepiece, erecting lens, and objective respectively. (a) What is the magnification of the telescope? (b) Is this an angular magnification or a lateral size magnification? (c) What is its length (objective to eyepiece distance)?

(Short Answer)

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Question 31

The focal length of a thin lens is 40 mm and its aperture diameter is 10 mm. What is the f-number of this lens?

(Multiple Choice)

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Question 32

What is the power of the combined lenses with individual powers of 8.0 diopters and 4.0 diopters?

(Multiple Choice)

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Question 33

The focal length of a lens is 5 m. What is the refractive power of this lens in diopters?

(Multiple Choice)

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Question 34

Spherical mirrors suffer from

(Multiple Choice)

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Question 35

Jill is farsighted and cannot see objects clearly that are closer to the eye than 80.0 cm. What is the refractive power of the contact lenses that will enable her to see objects at a distance of 25.0 cm from her eyes?

(Multiple Choice)

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(82)

Question 36

A far sighted person can not see clearly objects that are closer to his eyes than 60.0 cm. Which one of the following combinations represents the correct focal length and the refractive power of the contact lenses that will enable him to see the objects at a distance of 25.0 cm from his eyes?

(Multiple Choice)

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Question 37

What is the magnification of a magnifying glass of focal length 4.0 cm if the image is to be viewed by a relaxed eye with a near point of 25 cm?

(Multiple Choice)

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Question 38

The near point of a farsighted person is 65 cm. What power contact lens must he use to correct this problem and be able to read a book at a normal near point of 25 cm?

(Multiple Choice)

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Question 39

What is the maximum angular magnification of a magnifying glass of focal length 10 cm? (Assume the near point is at 25 cm.)

(Short Answer)

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Question 40

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Exam 27: Optical Instruments

An objective lens of a telescope has a 1.90 m focal length. When viewed through this telescope, the moon appears 5.25 times larger than normal. How far apart are the objective lens and the eyepiece when this instrument is focused on the moon?

Which one of the following is true regarding spherical aberration?

You have a choice between two lenses of focal lengths fa and fb = 2 fa to use as objective lens in building a refracting telescope. If the magnification you obtain using lens A is Ma, what will be the magnification when using lens B?

A camera lens has a focal length of 50.0 mm and an aperture setting of 4.00. What is the aperture diameter of this lens?

What is the focal length of the corrective contact lens needed by a nearsighted person whose far point is 60 cm?

The lens in a person's eye is too thick. The condition that this person has is called

The power of a lens is 4.0 diopters. What is the focal length of this lens?

The focal length of the lens of a simple camera is 40.0 mm. How far must the lens be moved to change the focus of the camera from a person 25 m away to one that is 4.0 m away?

A person with a longer near point can see an object as closely with the unaided eye as can a person with the shorter near point.

A magnifying glass uses a converging lens with a refractive power of 20 diopters. What is the magnification if the image is to be viewed by a relaxed eye with a near point of 25 cm?

The focal length of a thin lens is 40 mm and its aperture diameter is 10 mm. What is the f-number of this lens?

What is the power of the combined lenses with individual powers of 8.0 diopters and 4.0 diopters?

The focal length of a lens is 5 m. What is the refractive power of this lens in diopters?

Spherical mirrors suffer from

Jill is farsighted and cannot see objects clearly that are closer to the eye than 80.0 cm. What is the refractive power of the contact lenses that will enable her to see objects at a distance of 25.0 cm from her eyes?

A far sighted person can not see clearly objects that are closer to his eyes than 60.0 cm. Which one of the following combinations represents the correct focal length and the refractive power of the contact lenses that will enable him to see the objects at a distance of 25.0 cm from his eyes?

What is the magnification of a magnifying glass of focal length 4.0 cm if the image is to be viewed by a relaxed eye with a near point of 25 cm?

The near point of a farsighted person is 65 cm. What power contact lens must he use to correct this problem and be able to read a book at a normal near point of 25 cm?

What is the maximum angular magnification of a magnifying glass of focal length 10 cm? (Assume the near point is at 25 cm.)

Introduction to Physics

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You have a choice between two lenses of focal lengths f_a and f_b = 2 f_a to use as objective lens in building a refracting telescope. If the magnification you obtain using lens A is M_a, what will be the magnification when using lens B?