Question 1

Which statement about a single thin lens is correct?

Accepted Answer

A) A converging lens always produces a real inverted image. 
B) A diverging lens always produces a virtual inverted image. 
C) A converging lens sometimes produces a real upright image. 
D) A diverging lens always produces a virtual upright image. 
E) A diverging lens produces a virtual upright image only if the object is located between the lens and its focal point. 
A) A converging lens always produces a real inverted image. 
B) A diverging lens always produces a virtual inverted image. 
C) A converging lens sometimes produces a real upright image. 
D) A diverging lens always produces a virtual upright image. 
E) A diverging lens produces a virtual upright image only if the object is located between the lens and its focal point.

Question 2

Light enters glass from air.The angle of refraction will be

Accepted Answer

A) greater than the angle of incidence. 
B) equal to the angle of incidence. 
C) less than the angle of incidence. 
A) greater than the angle of incidence. 
B) equal to the angle of incidence. 
C) less than the angle of incidence.

Question 3

A light ray in air strikes a glass plate whose index of refraction is 1.42.Some of the light reflects off the surface of the plate,but most of it enters the glass.If the angle of refraction is one-half the angle of reflection,the angle of refraction is closest to which one of the following angles?

Accepted Answer

A) 45° 
B) 43° 
C) 41° 
D) 39° 
E) 37° 
A) 45° 
B) 43° 
C) 41° 
D) 39° 
E) 37°

Question 4

An object is 50 cm from a concave mirror of radius of curvature of magnitude 60 cm.How far is the image from the mirror?

Accepted Answer

A) 19 cm 
B) 35 cm 
C) 60 cm 
D) 75 cm 
E) 120 cm 
A) 19 cm 
B) 35 cm 
C) 60 cm 
D) 75 cm 
E) 120 cm

Question 5

As shown in the figure,a laser positioned on a ship is used to communicate with a small research submarine resting on the bottom of a lake.The laser is positioned 12 m above the surface of the water,and it strikes the water 20 m from the side of the ship.The water is 58 m deep and has an index of refraction of 1.33.How far horizontally is the submarine from the side of the ship? (Assume all numbers are accurate to three significant figures. )

Accepted Answer

A) 69 m 
B) 49 m 
C) 89 m 
D) 59 m 
E) 79 m 
A) 69 m 
B) 49 m 
C) 89 m 
D) 59 m 
E) 79 m

Question 6

How far from a +50-mm focal length lens,such as is used in many 35-mm cameras,must an object be placed so it will form a real image that is 3.0 times the size of the object?

Accepted Answer

A) 46 mm 
B) 52 mm 
C) 58 mm 
D) 67 mm 
A) 46 mm 
B) 52 mm 
C) 58 mm 
D) 67 mm

Question 7

Tan's face is 20 cm in front of a concave shaving mirror.If he observes his image to be twice as big and upright,what is the focal length of the mirror?

Accepted Answer

A) 10 cm 
B) -40 cm 
C) -50 cm 
D) 40 cm 
E) 50 cm 
A) 10 cm 
B) -40 cm 
C) -50 cm 
D) 40 cm 
E) 50 cm

Question 8

A lighted candle is placed a short distance from a plane mirror,as shown in the figure.At which location will the image of the flame appear to be located?

Accepted Answer

A) at A 
B) at B 
C) at C 
D) at M (at the mirror) 
A) at A 
B) at B 
C) at C 
D) at M (at the mirror)

Question 9

Light enters a substance from air at 30.0° to the normal.It continues within the substance at 23.0° to the normal.What is the critical angle for this substance when it is surrounded by air?

Accepted Answer

A) 53° 
B) 51.4° 
C) 36.7° 
D) 12.6° 
A) 53° 
B) 51.4° 
C) 36.7° 
D) 12.6°

Question 10

A 14-mm tall postage stamp is 4.0 mm from a converging lens.If the image of the stamp is 4.0 mm tall,how far is it from the lens?

Accepted Answer

A) 14 mm 
B) 8.7 mm 
C) 1.4 mm 
D) 1.1 mm 
A) 14 mm 
B) 8.7 mm 
C) 1.4 mm 
D) 1.1 mm

Question 11

When a flower petal is 4.0 cm in front of a converging lens,the inverted image is half the height of the petal.What is the focal length of this lens?

Accepted Answer

A) 1.3 cm 
B) 2.0 cm 
C) 4.0 cm 
D) 5.3 cm 
A) 1.3 cm 
B) 2.0 cm 
C) 4.0 cm 
D) 5.3 cm

Question 12

A light beam has speed c in vacuum and speed v in a certain plastic.The index of refraction n of this plastic is

Accepted Answer

A) n = cv. 
B) n = (v/c)2. 
C) n = v/c. 
D) n = c/v. 
E) n = (c/v)2. 
A) n = cv. 
B) n = (v/c)2. 
C) n = v/c. 
D) n = c/v. 
E) n = (c/v)2.

Question 13

A flashlight beam makes an angle of 60° with the plane of the surface of a calm lake before it enters the water.In the water what angle does the beam make with the plane of the surface? The index of refraction of water is 1.33.

Accepted Answer

A) 0° 
B) 30° 
C) 60° 
D) 22° 
E) 68° 
A) 0° 
B) 30° 
C) 60° 
D) 22° 
E) 68°

Question 14

A concave mirror having a focal length of magnitude 5.0 cm forms an image 4.0 cm behind the mirror.Where is the object for this image?

Accepted Answer

A) 2.2 cm in front of the mirror 
B) 2.2 cm behind the mirror 
C) 9.0 cm in front of the mirror 
D) 1.0 cm behind the mirror 
E) 20 cm behind the mirror 
A) 2.2 cm in front of the mirror 
B) 2.2 cm behind the mirror 
C) 9.0 cm in front of the mirror 
D) 1.0 cm behind the mirror 
E) 20 cm behind the mirror

Question 15

An object is placed 15 cm to the left of a double-convex lens of focal length 20 cm.Where is the image of this object located?

Accepted Answer

A) 60 cm to the right of the lens 
B) 60 cm to the left of the lens 
C) 8.6 cm to the right of the lens 
D) 8.6 cm to the left of the lens 
E) 30 cm to the left of the lens 
A) 60 cm to the right of the lens 
B) 60 cm to the left of the lens 
C) 8.6 cm to the right of the lens 
D) 8.6 cm to the left of the lens 
E) 30 cm to the left of the lens

Question 16

If the magnification of a mirror or lens is negative,it means that

Accepted Answer

A) the image is smaller than the object. 
B) the image is inverted and smaller than the object. 
C) the image is inverted. 
D) the object is farther from the mirror (or lens)than the image. 
E) the image is farther from the mirror (or lens)than the object. 
A) the image is smaller than the object. 
B) the image is inverted and smaller than the object. 
C) the image is inverted. 
D) the object is farther from the mirror (or lens)than the image. 
E) the image is farther from the mirror (or lens)than the object.

Question 17

A person's face is 30 cm in front of a concave spherical shaving mirror.If the image is an erect image that is 1.5 times as large as the object,what is the focal length mirror?

Accepted Answer

A) 20 cm 
B) 50 cm 
C) 70 cm 
D) 90 cm 
A) 20 cm 
B) 50 cm 
C) 70 cm 
D) 90 cm

Question 18

As you walk away from a plane mirror on a wall,the height of your image

Accepted Answer

A) gets smaller. 
B) may or may not get smaller,depending on where the observer is positioned. 
C) is always a real image,no matter how far you are from the mirror. 
D) changes from being a virtual image to a real image as you pass the focal point. 
E) is always the same size. 
A) gets smaller. 
B) may or may not get smaller,depending on where the observer is positioned. 
C) is always a real image,no matter how far you are from the mirror. 
D) changes from being a virtual image to a real image as you pass the focal point. 
E) is always the same size.

Question 19

A ray of light in glass strikes a water-glass interface at an angle of incidence equal to one-half the critical angle for that interface.The index of refraction for water is 1.33,and for the glass it is 1.43.What angle does the refracted ray in the water make with the normal?

Accepted Answer

A) 37° 
B) 42° 
C) 47° 
D) 32° 
E) 27° 
A) 37° 
B) 42° 
C) 47° 
D) 32° 
E) 27°

Question 20

An object is placed in front of a convex mirror at a distance larger than twice the magnitude of the focal length of the mirror.The image will appear

Accepted Answer

A) in front of the mirror. 
B) inverted and reduced. 
C) inverted and enlarged. 
D) upright and reduced. 
E) upright and enlarged. 
A) in front of the mirror. 
B) inverted and reduced. 
C) inverted and enlarged. 
D) upright and reduced. 
E) upright and enlarged.

Exam 26: Geometrical Optics

Which statement about a single thin lens is correct?

Light enters glass from air.The angle of refraction will be

A light ray in air strikes a glass plate whose index of refraction is 1.42.Some of the light reflects off the surface of the plate,but most of it enters the glass.If the angle of refraction is one-half the angle of reflection,the angle of refraction is closest to which one of the following angles?

An object is 50 cm from a concave mirror of radius of curvature of magnitude 60 cm.How far is the image from the mirror?

How far from a +50-mm focal length lens,such as is used in many 35-mm cameras,must an object be placed so it will form a real image that is 3.0 times the size of the object?

Tan's face is 20 cm in front of a concave shaving mirror.If he observes his image to be twice as big and upright,what is the focal length of the mirror?

A lighted candle is placed a short distance from a plane mirror,as shown in the figure.At which location will the image of the flame appear to be located?

Light enters a substance from air at 30.0° to the normal.It continues within the substance at 23.0° to the normal.What is the critical angle for this substance when it is surrounded by air?

A 14-mm tall postage stamp is 4.0 mm from a converging lens.If the image of the stamp is 4.0 mm tall,how far is it from the lens?

When a flower petal is 4.0 cm in front of a converging lens,the inverted image is half the height of the petal.What is the focal length of this lens?

A light beam has speed c in vacuum and speed v in a certain plastic.The index of refraction n of this plastic is

A flashlight beam makes an angle of 60° with the plane of the surface of a calm lake before it enters the water.In the water what angle does the beam make with the plane of the surface? The index of refraction of water is 1.33.

A concave mirror having a focal length of magnitude 5.0 cm forms an image 4.0 cm behind the mirror.Where is the object for this image?

An object is placed 15 cm to the left of a double-convex lens of focal length 20 cm.Where is the image of this object located?

If the magnification of a mirror or lens is negative,it means that

A person's face is 30 cm in front of a concave spherical shaving mirror.If the image is an erect image that is 1.5 times as large as the object,what is the focal length mirror?

As you walk away from a plane mirror on a wall,the height of your image

A ray of light in glass strikes a water-glass interface at an angle of incidence equal to one-half the critical angle for that interface.The index of refraction for water is 1.33,and for the glass it is 1.43.What angle does the refracted ray in the water make with the normal?

An object is placed in front of a convex mirror at a distance larger than twice the magnitude of the focal length of the mirror.The image will appear

Introduction to Physics

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Magnetism

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