Question 1

The deviation of a lens from its ideal behavior is referred to as

Accepted Answer

A)  spherical aberration. 
B)  chromatic aberration. 
C)  an aberration. 
D)  achromatic aberration. 
E)  None of the other choices is correct. 
A)  spherical aberration. 
B)  chromatic aberration. 
C)  an aberration. 
D)  achromatic aberration. 
E)  None of the other choices is correct. C

Question 2

The world's largest refracting telescope is operated at the Yerkes Observatory in Wisconsin. It has an objective of diameter of 1.02 m. Suppose such an instrument could be mounted on a spy satellite at an elevation of 300. km above the surface of the Earth. What is the minimum separation of two objects on the ground if their images are to be clearly resolved by this lens?
 (Assume an average wavelength of 0.55 μm for white light.)

Accepted Answer

0.20 m

Question 3

The length of a telescope is 2.00 m and the focal length of the objective is 2.0 cm. What is the focal length of the eyepiece?

Accepted Answer

A)  200 cm 
B)  202 cm 
C)  101 cm 
D)  2.0 cm 
E)  198 cm 
A)  200 cm 
B)  202 cm 
C)  101 cm 
D)  2.0 cm 
E)  198 cm E

Question 4

A nearsighted person has a far point that is 4.2 m from his eyes. What focal length lenses must he use in his contact lenses to allow him to focus on distant objects?

Accepted Answer

A)  -4.2 m 
B)  4.2 m 
C)  -5.2 m 
D)  5.2 m 
E)  4.8 m 
A)  -4.2 m 
B)  4.2 m 
C)  -5.2 m 
D)  5.2 m 
E)  4.8 m

Question 5

What is the maximum possible magnification of the converging lens of focal length 5 cm?

Accepted Answer

A)  2 
B)  3 
C)  4 
D)  5 
E)  6 
A)  2 
B)  3 
C)  4 
D)  5 
E)  6

Question 6

The focal lengths of the objective and the eyepiece of a microscope are 0.5 cm and 2.0 cm, respectively, and their separation adjusted for minimum eyestrain is 6.0 cm. If the microscope is focused on a small object, what is the distance between the object and the objective lens?

Accepted Answer

A)  0.6 cm 
B)  0.3 cm 
C)  0.4 cm 
D)  0.8 cm 
E)  0.7 cm 
A)  0.6 cm 
B)  0.3 cm 
C)  0.4 cm 
D)  0.8 cm 
E)  0.7 cm

Question 7

A person's eye lens is 2.8 cm away from the retina. What must the focal length of this lens be in order for an object placed at the far point of the eye to focus on the retina?

Accepted Answer

A)  -2.8 cm 
B)  2.8 cm 
C)  -2.4 cm 
D)  2.4 cm 
E)  2.2 cm 
A)  -2.8 cm 
B)  2.8 cm 
C)  -2.4 cm 
D)  2.4 cm 
E)  2.2 cm

Question 8

A student wishes to build a telescope. She has available an eyepiece of focal length -5.0 cm. What focal length objective is needed to obtain a magnification of 10x?

Accepted Answer

The answer of A student wishes to build a telescope....

Question 9

A little known fact is that both Robinson Crusoe and Friday wore eyeglasses. As it so happens, Robinson Crusoe was farsighted while Friday was nearsighted. Whose eyeglasses did they use whenever they wanted to start a fire by focusing the Sun's rays?

Accepted Answer

A)  Robinson Crusoe's 
B)  Friday's 
C)  Both would work equally well. 
D)  Both actually worked, but Friday's was a little bit better. 
E)  Neither's worked, they were in possession of matches. 
A)  Robinson Crusoe's 
B)  Friday's 
C)  Both would work equally well. 
D)  Both actually worked, but Friday's was a little bit better. 
E)  Neither's worked, they were in possession of matches.

Question 10

The focal length of the objective of a telescope is 0.2 m and the eyepiece has a focal length of 1.6 m. What is the length of this telescope?

Accepted Answer

A)  8.0 m 
B)  1.4 m 
C)  0.90 m 
D)  1.6 m 
E)  1.8 m 
A)  8.0 m 
B)  1.4 m 
C)  0.90 m 
D)  1.6 m 
E)  1.8 m

Question 11

Consider a magnifying glass with a power of 3.0 D.
(a) What is the maximum magnification for a person with a near point of 25. cm?
(b) What is the magnification when viewing with a relaxed eye?

Accepted Answer

The answer of Consider a magnifying glass with a power...

Question 12

The focal length of the objective of a telescope is 75.0 cm. While the eyepiece has a focal length of 6.00 cm, what is the magnifying power of this telescope?

Accepted Answer

A)  0.0800 
B)  0.645 
C)  450 
D)  12.5 
E)  200 
A)  0.0800 
B)  0.645 
C)  450 
D)  12.5 
E)  200

Question 13

Which one of the following is a correct statement?

Accepted Answer

A)  The image formed by the objective of a microscope is smaller than the object. 
B)  The image formed by the objective lens of a telescope is larger than the object. 
C)  The image formed by the eyepiece is real for both a microscope and a telescope. 
D)  The image formed by the objective lens of a microscope is larger than the object. 
A)  The image formed by the objective of a microscope is smaller than the object. 
B)  The image formed by the objective lens of a telescope is larger than the object. 
C)  The image formed by the eyepiece is real for both a microscope and a telescope. 
D)  The image formed by the objective lens of a microscope is larger than the object.

Question 14

A nearsighted person has a far point that is 4.2 m from his eyes. What focal length lenses in diopters he must use in his contacts to allow him to focus on distant objects?

Accepted Answer

A)  0.48 diopters 
B)  -0.48 diopters 
C)  -0.36 diopters 
D)  -0.24 diopters 
E)  0.24 diopters 
A)  0.48 diopters 
B)  -0.48 diopters 
C)  -0.36 diopters 
D)  -0.24 diopters 
E)  0.24 diopters

Question 15

The amount of light reaching the film in a camera is determined by the

Accepted Answer

A)  shutter speed. 
B)  f-stop. 
C)  focal length of the lens.. 
D)  focusing. 
E)  diameter of the aperture. 
A)  shutter speed. 
B)  f-stop. 
C)  focal length of the lens.. 
D)  focusing. 
E)  diameter of the aperture.

Question 16

A person with normal eyesight uses a converging lens of focal length 10 cm. He holds the lens close to his eyes to finish an engraving job. What is the magnifying power of the lens?

Accepted Answer

A)  3.5 
B)  4.5 
C)  6.5 
D)  7.5 
E)  8.5 
A)  3.5 
B)  4.5 
C)  6.5 
D)  7.5 
E)  8.5

Question 17

A person uses corrective glasses of power -8.5 D.
(a) Is this person nearsighted or farsighted?
(b) If the glasses are worn 2.0 cm from the eye, what is the person's far point without glasses?

Accepted Answer

(a)nearsig

Question 18

The length of a telescope is 1.60 m and it has a magnification of 60.0. What is the focal length of the eyepiece?

Accepted Answer

A)  2.62 cm 
B)  60.0 cm 
C)  100 cm 
D)  1.16 cm 
E)  96.0 cm 
A)  2.62 cm 
B)  60.0 cm 
C)  100 cm 
D)  1.16 cm 
E)  96.0 cm

Question 19

Chromatic aberration can be corrected by combining two or more lenses to form a compound lens.

Accepted Answer

A) True 
 B)False

Question 20

What power contact lens should be used to correct the vision of a farsighted person whose near point is 80 cm to see something clearly at a distance of 25 cm?

Accepted Answer

A)  2.8 diopters 
B)  -2.8 diopters 
C)  -4.0 diopters 
D)  -4.2 diopters 
E)  4.2 diopters 
A)  2.8 diopters 
B)  -2.8 diopters 
C)  -4.0 diopters 
D)  -4.2 diopters 
E)  4.2 diopters

Exam 27: Optical Instruments

The deviation of a lens from its ideal behavior is referred to as

The length of a telescope is 2.00 m and the focal length of the objective is 2.0 cm. What is the focal length of the eyepiece?

A nearsighted person has a far point that is 4.2 m from his eyes. What focal length lenses must he use in his contact lenses to allow him to focus on distant objects?

What is the maximum possible magnification of the converging lens of focal length 5 cm?

The focal lengths of the objective and the eyepiece of a microscope are 0.5 cm and 2.0 cm, respectively, and their separation adjusted for minimum eyestrain is 6.0 cm. If the microscope is focused on a small object, what is the distance between the object and the objective lens?

A person's eye lens is 2.8 cm away from the retina. What must the focal length of this lens be in order for an object placed at the far point of the eye to focus on the retina?

A student wishes to build a telescope. She has available an eyepiece of focal length -5.0 cm. What focal length objective is needed to obtain a magnification of 10x?

A little known fact is that both Robinson Crusoe and Friday wore eyeglasses. As it so happens, Robinson Crusoe was farsighted while Friday was nearsighted. Whose eyeglasses did they use whenever they wanted to start a fire by focusing the Sun's rays?

The focal length of the objective of a telescope is 0.2 m and the eyepiece has a focal length of 1.6 m. What is the length of this telescope?

Consider a magnifying glass with a power of 3.0 D. (a) What is the maximum magnification for a person with a near point of 25. cm? (b) What is the magnification when viewing with a relaxed eye?

The focal length of the objective of a telescope is 75.0 cm. While the eyepiece has a focal length of 6.00 cm, what is the magnifying power of this telescope?

Which one of the following is a correct statement?

A nearsighted person has a far point that is 4.2 m from his eyes. What focal length lenses in diopters he must use in his contacts to allow him to focus on distant objects?

The amount of light reaching the film in a camera is determined by the

A person with normal eyesight uses a converging lens of focal length 10 cm. He holds the lens close to his eyes to finish an engraving job. What is the magnifying power of the lens?

A person uses corrective glasses of power -8.5 D. (a) Is this person nearsighted or farsighted? (b) If the glasses are worn 2.0 cm from the eye, what is the person's far point without glasses?

The length of a telescope is 1.60 m and it has a magnification of 60.0. What is the focal length of the eyepiece?

Chromatic aberration can be corrected by combining two or more lenses to form a compound lens.

What power contact lens should be used to correct the vision of a farsighted person whose near point is 80 cm to see something clearly at a distance of 25 cm?

Introduction to Physics

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Magnetism

Magnetic Flux and Faradays Law of Induction

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Physical Optics: Interference and Diffraction

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