Question 1

In order for a lens to produce a real image,the light rays from the object

Accepted Answer

A) must actually be focused at the image location 
B) come to a stop at the image location. 
C) appear to be focused at the image location. 
D) must first travel in a straight line parallel to the axis. 
E) will always be focused at the image location. 
A) must actually be focused at the image location 
B) come to a stop at the image location. 
C) appear to be focused at the image location. 
D) must first travel in a straight line parallel to the axis. 
E) will always be focused at the image location.

Question 2

For a myopic eye that cannot focus on objects more than 25 cm in front of it,the power in diopters of the lens needed for distinct distant vision is

Accepted Answer

A) +25 diopters 
B) +4.0 diopters 
C) -4.0 diopters 
D) -2.5 diopters 
E) None of these is correct. 
A) +25 diopters 
B) +4.0 diopters 
C) -4.0 diopters 
D) -2.5 diopters 
E) None of these is correct.

Question 3

A convenience's store clerk observes at shopper 4 m in front of a convex mirror.The image of the shopper is located 1.5 m behind the mirror.The focal length of the mirror is

Accepted Answer

A) -2.5 m 
B) -2.4 m 
C) -0.67 m 
D) -1.1 m 
E) none of the above 
A) -2.5 m 
B) -2.4 m 
C) -0.67 m 
D) -1.1 m 
E) none of the above

Question 4

A simple refracting telescope has an objective of focal length 75 cm and an eyepiece of focal length 3.0 cm.When viewed by the naked eye,the moon subtends an angle of about 0.009 radians.What angle is subtended by the moon when it is viewed through this telescope?

Accepted Answer

A) 0.022 rad 
B) 0.22 rad 
C) 3.6 $\times$ 10-4 rad 
D) 0.078 rad 
E) 3.0 $\times$ 10-3 rad 
A) 0.022 rad 
B) 0.22 rad 
C) 3.6 $\times$ 10-4 rad 
D) 0.078 rad 
E) 3.0 $\times$ 10-3 rad

Question 5

A positive lens of focal length 40 cm is placed 20 cm behind a negative lens of focal length -80 cm.An object is placed 240 cm in front of the negative lens.The final image distance relative to the positive lens is

Accepted Answer

A) -40 cm 
B) 56 cm 
C) -56 cm 
D) 80 cm 
E) -80 cm 
A) -40 cm 
B) 56 cm 
C) -56 cm 
D) 80 cm 
E) -80 cm

Question 6

Two plane mirrors are arranged so that the reflecting surfaces face each other and are parallel.The mirrors are located at x =   2 m and x = 2 m.An object is located at x = 1 m.The second image from the left mirror is located at

Accepted Answer

A) -4 m 
B) -5 m 
C) -6 m 
D) -8 m 
E) None of the above. 
A) -4 m 
B) -5 m 
C) -6 m 
D) -8 m 
E) None of the above.

Question 7

A 6-cm-high candle is placed in front of a converging lens with a focal length of magnitude 30 cm.If the image distance is +50 cm,then find the object distance to the lens.

Accepted Answer

A) 75 cm 
B) 50 cm 
C) 60 cm 
D) 80 cm 
E) None of these is correct. 
A) 75 cm 
B) 50 cm 
C) 60 cm 
D) 80 cm 
E) None of these is correct.

Question 8

A jeweler's loupe (magnifying glass)has a focal length of 2.00 cm.Assuming that the loupe is held so that it forms an image at the normal near point of 25.0 cm,what magnification does it provide?

Accepted Answer

A) 46 
B) 54 
C) 11.5 
D) 50 
E) 15.4 
A) 46 
B) 54 
C) 11.5 
D) 50 
E) 15.4

Question 9

Your hypermetropic eye cannot focus on objects that are more than 225 cm from it.The power in diopters of the lens you need for distinct distant vision is

Accepted Answer

A) +2.25 diopters 
B) +4.4 $\times$ 10-3 diopters 
C) +3.6 diopters 
D) -0.44 diopters 
E) None of these is correct. 
A) +2.25 diopters 
B) +4.4 $\times$ 10-3 diopters 
C) +3.6 diopters 
D) -0.44 diopters 
E) None of these is correct.

Question 10

A stamp collector with a normal near point (25 cm)needs a magnifying power of 10 to examine her stamps.If one of the stamps is 2.0 cm wide,what is the angle (in degrees)subtended by the stamp when it is viewed through her magnifier?

Accepted Answer

A) 23º 
B) 46º 
C) 0.80º 
D) 4.6º 
E) 1.6º 
A) 23º 
B) 46º 
C) 0.80º 
D) 4.6º 
E) 1.6º

Question 11

Which of the following statements is false?

Accepted Answer

A) The image produced by a diverging lens is always virtual,upright,and reduced in size. 
B) The image produced by a converging lens can be virtual,upright,and magnified in size. 
C) The image produced by a converging lens can never virtual,upright,and reduced in size. 
D) To produce a real image,an object has to be place further away than the focal point of a converging lens. 
E) The image produced by a converging lens cannot be real,inverted,and reduced in size. 
A) The image produced by a diverging lens is always virtual,upright,and reduced in size. 
B) The image produced by a converging lens can be virtual,upright,and magnified in size. 
C) The image produced by a converging lens can never virtual,upright,and reduced in size. 
D) To produce a real image,an object has to be place further away than the focal point of a converging lens. 
E) The image produced by a converging lens cannot be real,inverted,and reduced in size.

Question 12

Dentists often use concave mirrors to see better.In order for the mirror to produce an enlarged image of a tooth,the tooth must be placed

Accepted Answer

A) at the focal point of the mirror. 
B) further than the focal point of the mirror. 
C) closer than the focal point of the mirror. 
D) at any distance. 
E) Concave mirrors cannot produce an enlarged image. 
A) at the focal point of the mirror. 
B) further than the focal point of the mirror. 
C) closer than the focal point of the mirror. 
D) at any distance. 
E) Concave mirrors cannot produce an enlarged image.

Question 13

An object is 10 cm from a concave spherical mirror whose radius is 10 cm.The image is

Accepted Answer

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

Question 14

Your farsighted boyfriend requires lenses with a power of 1.85 diopters to read comfortably from a book that is 25.0 cm from his eyes.What is his near point without the lenses?

Accepted Answer

A) 54.1 cm 
B) 4.00 cm 
C) 46.5 cm 
D) 42.9 cm 
E) 36.2 cm 
A) 54.1 cm 
B) 4.00 cm 
C) 46.5 cm 
D) 42.9 cm 
E) 36.2 cm

Question 15

A converging lens and a screen are so arranged that an image of the sun falls on the screen.The distance from the lens to the screen is

Accepted Answer

A) the focal length. 
B) the object distance. 
C) the magnifying power. 
D) one-half the radius of curvature of one of the lens faces. 
E) the average radius of curvature of the two lens faces. 
A) the focal length. 
B) the object distance. 
C) the magnifying power. 
D) one-half the radius of curvature of one of the lens faces. 
E) the average radius of curvature of the two lens faces.

Question 16

An object is placed 4.24 cm in front of a concave mirror that has a radius of curvature of 20.3 cm.The image is located

Accepted Answer

A) 12.1 cm in front of the mirror. 
B) 12.1 cm behind the mirror. 
C) 7.62 cm behind the mirror. 
D) 16.9 cm behind the mirror. 
E) 16.9 cm in front of the mirror. 
A) 12.1 cm in front of the mirror. 
B) 12.1 cm behind the mirror. 
C) 7.62 cm behind the mirror. 
D) 16.9 cm behind the mirror. 
E) 16.9 cm in front of the mirror.

Question 17

To project an image onto a screen using a lens,

Accepted Answer

A) the lens must be diverging and the object must be farther from the lens than the second focal point. 
B) the lens must be converging and the object must be between the first focal point and the lens. 
C) the lens must be diverging and the image must be farther from the lens than the second focal point. 
D) the lens must be converging and the object must be farther from the lens than the first focal point. 
E) the lens must be diverging and the object must be between the first focal point and the lens. 
A) the lens must be diverging and the object must be farther from the lens than the second focal point. 
B) the lens must be converging and the object must be between the first focal point and the lens. 
C) the lens must be diverging and the image must be farther from the lens than the second focal point. 
D) the lens must be converging and the object must be farther from the lens than the first focal point. 
E) the lens must be diverging and the object must be between the first focal point and the lens.

Question 18

Your near point is xnp,and you're using a lens of focal length xnp/5 as a simple magnifier.What magnification do you obtain?

Accepted Answer

A) 10 
B) 50 
C) 0.1 
D) 0.2 
E) 5 
A) 10 
B) 50 
C) 0.1 
D) 0.2 
E) 5

Question 19

A simple magnifier gives a magnification of 8 times when it is used by a person with a normal near point (25 cm).What is the magnifying power when it is used by a person whose near point is 15 cm?

Accepted Answer

A) 4.8 
B) 13 
C) 8.0 
D) 15 
E) 9.6 
A) 4.8 
B) 13 
C) 8.0 
D) 15 
E) 9.6

Question 20

When an object is farther from a convex mirror than the mirror's focal point,the

Accepted Answer

A) magnification is less than one. 
B) image distance is greater than the object distance. 
C) magnification is equal to one. 
D) image is real. 
E) image is inverted. 
A) magnification is less than one. 
B) image distance is greater than the object distance. 
C) magnification is equal to one. 
D) image is real. 
E) image is inverted.

Exam 32: Optical Images

In order for a lens to produce a real image,the light rays from the object

For a myopic eye that cannot focus on objects more than 25 cm in front of it,the power in diopters of the lens needed for distinct distant vision is

A convenience's store clerk observes at shopper 4 m in front of a convex mirror.The image of the shopper is located 1.5 m behind the mirror.The focal length of the mirror is

A simple refracting telescope has an objective of focal length 75 cm and an eyepiece of focal length 3.0 cm.When viewed by the naked eye,the moon subtends an angle of about 0.009 radians.What angle is subtended by the moon when it is viewed through this telescope?

A positive lens of focal length 40 cm is placed 20 cm behind a negative lens of focal length -80 cm.An object is placed 240 cm in front of the negative lens.The final image distance relative to the positive lens is

Two plane mirrors are arranged so that the reflecting surfaces face each other and are parallel.The mirrors are located at x = 2 m and x = 2 m.An object is located at x = 1 m.The second image from the left mirror is located at

A 6-cm-high candle is placed in front of a converging lens with a focal length of magnitude 30 cm.If the image distance is +50 cm,then find the object distance to the lens.

A jeweler's loupe (magnifying glass)has a focal length of 2.00 cm.Assuming that the loupe is held so that it forms an image at the normal near point of 25.0 cm,what magnification does it provide?

Your hypermetropic eye cannot focus on objects that are more than 225 cm from it.The power in diopters of the lens you need for distinct distant vision is

A stamp collector with a normal near point (25 cm)needs a magnifying power of 10 to examine her stamps.If one of the stamps is 2.0 cm wide,what is the angle (in degrees)subtended by the stamp when it is viewed through her magnifier?

Which of the following statements is false?

Dentists often use concave mirrors to see better.In order for the mirror to produce an enlarged image of a tooth,the tooth must be placed

An object is 10 cm from a concave spherical mirror whose radius is 10 cm.The image is

Your farsighted boyfriend requires lenses with a power of 1.85 diopters to read comfortably from a book that is 25.0 cm from his eyes.What is his near point without the lenses?

A converging lens and a screen are so arranged that an image of the sun falls on the screen.The distance from the lens to the screen is

An object is placed 4.24 cm in front of a concave mirror that has a radius of curvature of 20.3 cm.The image is located

To project an image onto a screen using a lens,

Your near point is xnp,and you're using a lens of focal length xnp/5 as a simple magnifier.What magnification do you obtain?

A simple magnifier gives a magnification of 8 times when it is used by a person with a normal near point (25 cm).What is the magnifying power when it is used by a person whose near point is 15 cm?

When an object is farther from a convex mirror than the mirror's focal point,the

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Your near point is x_np,and you're using a lens of focal length x_np/5 as a simple magnifier.What magnification do you obtain?