Question 1

Suppose your near point is 25.0 cm and you want to obtain a magnifying power of 20 with a simple magnifier.What focal-length lens should you choose?

Accepted Answer

A) 20 cm 
B) 25 cm 
C) 1.3 cm 
D) 1.0 m 
E) 80 cm 
A) 20 cm 
B) 25 cm 
C) 1.3 cm 
D) 1.0 m 
E) 80 cm

Question 2

A positive lens has a focal length f.The only way to get a magnification of -1 is to

Accepted Answer

A) place a real object at the focal point. 
B) place a real object at a distance 2f from the lens. 
C) place a virtual object at a distance 2f from the lens. 
D) Magnifications can never be negative. 
E) None of these is correct. 
A) place a real object at the focal point. 
B) place a real object at a distance 2f from the lens. 
C) place a virtual object at a distance 2f from the lens. 
D) Magnifications can never be negative. 
E) None of these is correct.

Question 3

An object placed 7.62 cm from a simple magnifying glass of focal length 10.2 cm is magnified

Accepted Answer

A) 1$\times$ 
B) 2$\times$ 
C) 3$\times$ 
D) 4$\times$ 
E) 0.75$\times$ 
A) 1$\times$ 
B) 2$\times$ 
C) 3$\times$ 
D) 4$\times$ 
E) 0.75$\times$

Question 4

An object is placed 20 cm to the left of a converging lens with a focal length of 8 cm.A second converging lens of focal length 12 cm is placed to the right of the first lens.If the final image of the combined lens system is virtual and 15 cm from the second lens,then calculate the distance between the two lenses.

Accepted Answer

A) 73.3 cm 
B) 46.7 cm 
C) 60.0 cm 
D) 6.63 cm 
E) 20.0 cm 
A) 73.3 cm 
B) 46.7 cm 
C) 60.0 cm 
D) 6.63 cm 
E) 20.0 cm

Question 5

A real object is 42.1 cm from a negative lens that has a focal length of 25.6 cm.The object is 2.45 mm high.The height and orientation of the image are

Accepted Answer

A) 3.8 mm and inverted. 
B) 0.93 mm and erect. 
C) 6.4 mm and erect. 
D) 0.38 mm and erect. 
E) None of these is correct. 
A) 3.8 mm and inverted. 
B) 0.93 mm and erect. 
C) 6.4 mm and erect. 
D) 0.38 mm and erect. 
E) None of these is correct.

Question 6

A concave spherical mirror can produce which one of the following types of images?

Accepted Answer

A) virtual,inverted,and magnified 
B) real,erect,and magnified 
C) diminished,erect,and virtual 
D) magnified,erect,and virtual 
E) diminished,real,and erect 
A) virtual,inverted,and magnified 
B) real,erect,and magnified 
C) diminished,erect,and virtual 
D) magnified,erect,and virtual 
E) diminished,real,and erect

Question 7

When an object is farther from a concave mirror than twice the mirror's focal length,the

Accepted Answer

A) magnification is less than one. 
B) image is inverted. 
C) image distance is less than the object distance. 
D) image is real. 
E) All of these are correct. 
A) magnification is less than one. 
B) image is inverted. 
C) image distance is less than the object distance. 
D) image is real. 
E) All of these are correct.

Question 8

A real object is placed 9.00 cm from a converging lens that has a focal length of 24.0 cm.The image is

Accepted Answer

A) 0.119 cm from the lens,real,and smaller than the object. 
B) 0.119 cm from the lens,virtual,and smaller than the object. 
C) 14.4 cm from the lens,real,and enlarged. 
D) 14.4 cm from the lens,virtual,and enlarged. 
E) 11.7 cm from the lens,virtual,and enlarged. 
A) 0.119 cm from the lens,real,and smaller than the object. 
B) 0.119 cm from the lens,virtual,and smaller than the object. 
C) 14.4 cm from the lens,real,and enlarged. 
D) 14.4 cm from the lens,virtual,and enlarged. 
E) 11.7 cm from the lens,virtual,and enlarged.

Question 9

A short sighted person's range of vision is between 12 cm and 35 cm from the eye.What strength lens (in Diopters)is needed to move her near point to 25 cm?

Accepted Answer

A) -3.4 D 
B) +3.4 D 
C) -12.0 D 
D) -4.3 D 
E) +4.3 D 
A) -3.4 D 
B) +3.4 D 
C) -12.0 D 
D) -4.3 D 
E) +4.3 D

Question 10

What is the minimum height of a plane mirror in which a standing woman can see her entire body reflected?

Accepted Answer

A) It must equal her height. 
B) It depends on how far from the mirror the woman stands. 
C) It depends on the focal length of the mirror. 
D) It must be one-half her height. 
E) It depends on the image distance. 
A) It must equal her height. 
B) It depends on how far from the mirror the woman stands. 
C) It depends on the focal length of the mirror. 
D) It must be one-half her height. 
E) It depends on the image distance.

Question 11

The theoretical limit to the sharpness of focus of a lens system is determined by

Accepted Answer

A) spherical aberration limitations. 
B) chromatic aberration limitations. 
C) astigmatic limitations. 
D) diffraction limitations. 
E) the relative smoothness of the lens surface. 
A) spherical aberration limitations. 
B) chromatic aberration limitations. 
C) astigmatic limitations. 
D) diffraction limitations. 
E) the relative smoothness of the lens surface.

Question 12

When a human eye that has a power of +60 D is fitted with a contact lens of -10 D,the equivalent lens combination is

Accepted Answer

A) diverging and of focal length 2 cm. 
B) converging and of focal length 50 cm. 
C) converging and of focal length 2 cm. 
D) focal length 0.02 cm. 
E) focal length 0.2 cm. 
A) diverging and of focal length 2 cm. 
B) converging and of focal length 50 cm. 
C) converging and of focal length 2 cm. 
D) focal length 0.02 cm. 
E) focal length 0.2 cm.

Question 13

An object is placed 200 cm from a screen.When a converging lens is placed between the object and screen at a distance of 160 cm from the object,an image is formed on the screen.Without moving the object or screen,an image can also be formed on the screen when the distance from the object to the lens is

Accepted Answer

A) 8 cm 
B) 16 cm 
C) 20 cm 
D) 32 cm 
E) 40 cm 
A) 8 cm 
B) 16 cm 
C) 20 cm 
D) 32 cm 
E) 40 cm

Question 14

The eyes of some people wearing glasses appear larger than normal.The glasses help the people to see

Accepted Answer

A) better in the dark. 
B) objects that are far away. 
C) objects that are close by. 
D) moving object better. 
E) better in bright lights. 
A) better in the dark. 
B) objects that are far away. 
C) objects that are close by. 
D) moving object better. 
E) better in bright lights.

Question 15

A farsighted person uses glasses to read.The person then sees _____ print that appears _____ than is actually the case.

Accepted Answer

A) larger; closer 
B) larger; farther away 
C) smaller; closer 
D) smaller; farther away 
E) actual sized; farther away 
A) larger; closer 
B) larger; farther away 
C) smaller; closer 
D) smaller; farther away 
E) actual sized; farther away

Question 16

A person uses a simple magnifying glass to study faces on an old school photograph.If the person has a near point of 25 cm and the magnifying glass (which is held close to the eye)has a focal length of 6 cm,then calculate the distance the photograph must be held in front of the magnifying glass.

Accepted Answer

A) 7.9 cm 
B) 4.8 cm 
C) 10.8 cm 
D) 12.7 cm 
E) none of the above 
A) 7.9 cm 
B) 4.8 cm 
C) 10.8 cm 
D) 12.7 cm 
E) none of the above

Question 17

Two parallel mirrors are a distance d apart.An object is placed 1.0 inch in front of the right-hand mirror.After 5 reflections,with the first reflection from the right-hand mirror,an image is located 17 inches behind the right-hand mirror.Calculate the distance between the mirrors.

Accepted Answer

A) 5.3 in 
B) 3.2 in 
C) 6.0 in 
D) 4.0 in 
E) 3.6 in 
A) 5.3 in 
B) 3.2 in 
C) 6.0 in 
D) 4.0 in 
E) 3.6 in

Question 18

A diverging lens has a focal length of magnitude 20 cm.An object is placed 10 cm in front of the diverging lens.Calculate the magnification of the image and whether it is upright or inverted.

Accepted Answer

A) 0.67 upright 
B) 0.52 upright 
C) 0.67 inverted 
D) 1.5 upright 
E) 0.85 inverted 
A) 0.67 upright 
B) 0.52 upright 
C) 0.67 inverted 
D) 1.5 upright 
E) 0.85 inverted

Question 19

Your nearsighted instructor cannot focus clearly on objects more distant than 150 cm from her eyes.What power lenses are required for her to see distant students clearly?

Accepted Answer

A) 1.5 
B) 0.15 
C) 0.67 
D) -0.67 
E) -1.5 
A) 1.5 
B) 0.15 
C) 0.67 
D) -0.67 
E) -1.5

Question 20

A real object in front of a concave spherical mirror can produce an image that is

Accepted Answer

A) virtual,inverted,and magnified. 
B) real,erect,and magnified. 
C) diminished,erect,and virtual. 
D) magnified,erect,and virtual. 
E) diminished,real,and erect. 
A) virtual,inverted,and magnified. 
B) real,erect,and magnified. 
C) diminished,erect,and virtual. 
D) magnified,erect,and virtual. 
E) diminished,real,and erect.

Exam 32: Optical Images

Suppose your near point is 25.0 cm and you want to obtain a magnifying power of 20 with a simple magnifier.What focal-length lens should you choose?

A positive lens has a focal length f.The only way to get a magnification of -1 is to

An object placed 7.62 cm from a simple magnifying glass of focal length 10.2 cm is magnified

A real object is 42.1 cm from a negative lens that has a focal length of 25.6 cm.The object is 2.45 mm high.The height and orientation of the image are

A concave spherical mirror can produce which one of the following types of images?

When an object is farther from a concave mirror than twice the mirror's focal length,the

A real object is placed 9.00 cm from a converging lens that has a focal length of 24.0 cm.The image is

A short sighted person's range of vision is between 12 cm and 35 cm from the eye.What strength lens (in Diopters)is needed to move her near point to 25 cm?

What is the minimum height of a plane mirror in which a standing woman can see her entire body reflected?

The theoretical limit to the sharpness of focus of a lens system is determined by

When a human eye that has a power of +60 D is fitted with a contact lens of -10 D,the equivalent lens combination is

The eyes of some people wearing glasses appear larger than normal.The glasses help the people to see

A farsighted person uses glasses to read.The person then sees _____ print that appears _____ than is actually the case.

A person uses a simple magnifying glass to study faces on an old school photograph.If the person has a near point of 25 cm and the magnifying glass (which is held close to the eye)has a focal length of 6 cm,then calculate the distance the photograph must be held in front of the magnifying glass.

Two parallel mirrors are a distance d apart.An object is placed 1.0 inch in front of the right-hand mirror.After 5 reflections,with the first reflection from the right-hand mirror,an image is located 17 inches behind the right-hand mirror.Calculate the distance between the mirrors.

A diverging lens has a focal length of magnitude 20 cm.An object is placed 10 cm in front of the diverging lens.Calculate the magnification of the image and whether it is upright or inverted.

Your nearsighted instructor cannot focus clearly on objects more distant than 150 cm from her eyes.What power lenses are required for her to see distant students clearly?

A real object in front of a concave spherical mirror can produce an image that is

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A farsighted person uses glasses to read.The person then sees _ print that appears _ than is actually the case.