Question 1

The length of a telescope is 2.00 m and the focal length of the objective lens 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

Question 2

A microscope has an objective lens of focal length 1.40 mm and an eyepiece of focal length 20.00 mm.It is adjusted for minimum eyestrain for persons with a near point of 25.0 cm.A blood sample is placed 1.50 mm from the objective.How far apart are the lenses?

Accepted Answer

A) 20 mm 
B) 21 mm 
C) 23 mm 
D) 41 mm 
A) 20 mm 
B) 21 mm 
C) 23 mm 
D) 41 mm

Question 3

The focal length of the objective lens of a telescope is 0.20 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 4

Spherical lenses suffer from

Accepted Answer

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. 
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.

Question 5

A student constructs an astronomical telescope and wishes it to have a magnification of 10.If the telescope has an objective lens of focal length 0.50 m,what must be the focal length of the eyepiece?

Accepted Answer

A) 2.5 cm 
B) 5.0 cm 
C) 10 cm 
D) 25 cm 
A) 2.5 cm 
B) 5.0 cm 
C) 10 cm 
D) 25 cm

Question 6

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 7

A magnifying glass has a focal length of 7.0 cm.What is the angular magnification if the image is viewed by a person having a relaxed eye with the near point of 25 cm?

Accepted Answer

A) 1.6 
B) 2.6 
C) 3.6 
D) 4.6 
A) 1.6 
B) 2.6 
C) 3.6 
D) 4.6

Question 8

A simple digital camera lens with focal length  
Perfectly focuses the image of an object on a CCD sensor located a distance  
Away from the lens.The object now moves away from the lens and the new distance between the lens and sensor is  
(a)By what amount did the object change its distance from the lens?
(b)What is the new magnification?

Accepted Answer

A) (a)0.08 cm (b)3.33 
B) (a)0.03 cm (b)0.30 
C) (a)990.00 cm (b)0.23 
D) (a)12.22 cm (b)4.33 
A) (a)0.08 cm (b)3.33 
B) (a)0.03 cm (b)0.30 
C) (a)990.00 cm (b)0.23 
D) (a)12.22 cm (b)4.33

Question 9

A nearsighted person has a far point that is 4.2 m from his eyes.What power contact lenses must he wear to allow him to focus on distant mountains?

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 10

What is the power of a lens that has a focal length of -40 cm and a width of 2.0 cm?

Accepted Answer

A) -2.5 diopters 
B) -0.50 diopters 
C) +4.0 diopters 
D) +2.5 diopters 
E) -50 diopters 
A) -2.5 diopters 
B) -0.50 diopters 
C) +4.0 diopters 
D) +2.5 diopters 
E) -50 diopters

Question 11

A nearsighted person has a far point of 18 cm.What power contact lenses will allow this person to comfortably see distant objects clearly?

Accepted Answer

A) +5.6 diopters 
B) -5.6 diopters 
C) +0.056 diopters 
D) -0.056 diopters 
A) +5.6 diopters 
B) -5.6 diopters 
C) +0.056 diopters 
D) -0.056 diopters

Question 12

A person is designing a telescope with a magnification of 10.If the telescope is limited to a length of 0.20 m,what is the approximate focal length of the objective?

Accepted Answer

A) 16 cm 
B) 17 cm 
C) 18 cm 
D) 19 cm 
A) 16 cm 
B) 17 cm 
C) 18 cm 
D) 19 cm

Question 13

In a compound microscope

Accepted Answer

A) both the objective and the eyepiece form real images. 
B) magnification is provided by the objective lens and not by the eyepiece.The eyepiece merely increases the resolution of the image viewed. 
C) magnification is provided by the objective and not by the eyepiece.The eyepiece merely increases the brightness of the image viewed. 
D) the magnification is m1 + M2,where m1 is the lateral magnification of the objective and M2 is the angular magnification of the eyepiece. 
E) the image of the objective serves as the object for the eyepiece. 
A) both the objective and the eyepiece form real images. 
B) magnification is provided by the objective lens and not by the eyepiece.The eyepiece merely increases the resolution of the image viewed. 
C) magnification is provided by the objective and not by the eyepiece.The eyepiece merely increases the brightness of the image viewed. 
D) the magnification is m1 + M2,where m1 is the lateral magnification of the objective and M2 is the angular magnification of the eyepiece. 
E) the image of the objective serves as the object for the eyepiece.

Question 14

Cal is viewing the Moon with his new telescope,using a 10-mm focal length eyepiece.For greater detail,he wishes to double the magnification of his telescope.An eyepiece having which one of the following characteristics will accomplish this for him?

Accepted Answer

A) 40 diopters 
B) 8 mm 
C) 12 mm 
D) 200 diopters 
E) 5 diopters 
A) 40 diopters 
B) 8 mm 
C) 12 mm 
D) 200 diopters 
E) 5 diopters

Question 15

As a treatment for cataracts (a cloudiness of the lens of the eye),the natural lens is removed and a plastic lens is implanted.After this is done a person can see distant objects clearly,but he cannot accommodate to focus on nearby objects.If such a person wanted to read a book at a distance of 25 cm,he would have to wear contact lenses having a diopter power of

Accepted Answer

A) +2.78 diopters. 
B) +3.33 diopters. 
C) -1.78 diopters. 
D) +4.00 diopters. 
E) -4.00 diopters. 
A) +2.78 diopters. 
B) +3.33 diopters. 
C) -1.78 diopters. 
D) +4.00 diopters. 
E) -4.00 diopters.

Question 16

For relaxed viewing with a microscope or a telescope,the eyepiece is adjusted to place the image at

Accepted Answer

A) the near point of the eye. 
B) the pupil of the eye. 
C) the focal point of the eyepiece. 
D) infinity. 
E) the focal point of the objective lens. 
A) the near point of the eye. 
B) the pupil of the eye. 
C) the focal point of the eyepiece. 
D) infinity. 
E) the focal point of the objective lens.

Question 17

The focal length of the objective lens of a telescope is 75.0 cm,and the eyepiece has a focal length of 6.00 cm.What is the magnification 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 18

Nearsightedness is usually corrected with

Accepted Answer

A) converging lenses. 
B) diverging lenses. 
C) convex mirrors. 
D) cylindrical lenses. 
E) concave mirrors. 
A) converging lenses. 
B) diverging lenses. 
C) convex mirrors. 
D) cylindrical lenses. 
E) concave mirrors.

Question 19

A machinist with normal vision has a near point at 25 cm.This machinist wears +4.25-diopter eyeglasses in order to do very close work.With these eyeglasses,what is the near point of the machinist? Assume that he wears the glasses extremely close to his eyes.

Accepted Answer

A) 12 cm 
B) 10 cm 
C) 7 cm 
D) 15 cm 
E) 17 cm 
A) 12 cm 
B) 10 cm 
C) 7 cm 
D) 15 cm 
E) 17 cm

Question 20

A farsighted girl has a near point at 2.0 m but has forgotten her glasses at home.The girl borrows eyeglasses that have a power of +2.75 diopters.With these eyeglasses,what is the near point of the girl,assuming that she wears them extremely close to her eyes?

Accepted Answer

A) 28 cm 
B) 31 cm 
C) 33 cm 
D) 37 cm 
E) 40 cm 
A) 28 cm 
B) 31 cm 
C) 33 cm 
D) 37 cm 
E) 40 cm

Exam 27: Optical Instruments

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

A microscope has an objective lens of focal length 1.40 mm and an eyepiece of focal length 20.00 mm.It is adjusted for minimum eyestrain for persons with a near point of 25.0 cm.A blood sample is placed 1.50 mm from the objective.How far apart are the lenses?

The focal length of the objective lens of a telescope is 0.20 m and the eyepiece has a focal length of 1.6 m.What is the length of this telescope?

Spherical lenses suffer from

A student constructs an astronomical telescope and wishes it to have a magnification of 10.If the telescope has an objective lens of focal length 0.50 m,what must be the focal length of the eyepiece?

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?

A magnifying glass has a focal length of 7.0 cm.What is the angular magnification if the image is viewed by a person having a relaxed eye with the near point of 25 cm?

A nearsighted person has a far point that is 4.2 m from his eyes.What power contact lenses must he wear to allow him to focus on distant mountains?

What is the power of a lens that has a focal length of -40 cm and a width of 2.0 cm?

A nearsighted person has a far point of 18 cm.What power contact lenses will allow this person to comfortably see distant objects clearly?

A person is designing a telescope with a magnification of 10.If the telescope is limited to a length of 0.20 m,what is the approximate focal length of the objective?

In a compound microscope

Cal is viewing the Moon with his new telescope,using a 10-mm focal length eyepiece.For greater detail,he wishes to double the magnification of his telescope.An eyepiece having which one of the following characteristics will accomplish this for him?

For relaxed viewing with a microscope or a telescope,the eyepiece is adjusted to place the image at

The focal length of the objective lens of a telescope is 75.0 cm,and the eyepiece has a focal length of 6.00 cm.What is the magnification of this telescope?

Nearsightedness is usually corrected with

A machinist with normal vision has a near point at 25 cm.This machinist wears +4.25-diopter eyeglasses in order to do very close work.With these eyeglasses,what is the near point of the machinist? Assume that he wears the glasses extremely close to his eyes.

A farsighted girl has a near point at 2.0 m but has forgotten her glasses at home.The girl borrows eyeglasses that have a power of +2.75 diopters.With these eyeglasses,what is the near point of the girl,assuming that she wears them extremely close to her eyes?

Introduction to Physics

One-Dimensional Kinematics

Vectors in Physics

Two-Dimensional Kinematics

Newtons Laws of Motion

Applications of Newtons Laws

Work and Kinetic Energy

Potential Energy and Conservation of Energy

Linear Momentum and Collisions

Rotational Kinematics and Energy

Rotational Dynamics and Static Equilibrium

Gravity

Oscillations About Equilibrium

Waves and Sound

Fluids

Temperature and Heat

Phases and Phase Changes

The Laws of Thermodynamics

Electric Charges, Forces, and Fields

Electric Potential and Electric

Electric Current and Direct-Current Circuits

Magnetism

Magnetic Flux and Faradays Law of Induction

Alternating-Current Circuits

Electromagnetic Waves

Geometrical Optics

Physical Optics: Interference and Diffraction

Relativity

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