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Multiple Choice Quiz
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1

Describe the image of an object positioned 20 cm from a concave spherical mirror of radius 60 cm.
A)virtual, erect, 60 cm in front of mirror, magnified 3 times
B)virtual, erect, 60 cm behind mirror, magnified 3 times
C)virtual, erect, 60 cm behind mirror, magnified -3 times
D)virtual, erect, 12 cm behind mirror, magnified 3 times
2

An object 7.0 cm high is placed 15 cm from a convex spherical mirror of radius 45 cm. Describe its image.
A)virtual, erect, 9.0 cm behind mirror, 4.2 cm high
B)virtual, erect, 45.0 cm behind mirror, 4.2 cm high
C)virtual, erect, 9.0 cm behind mirror, 0.6 cm high
D)virtual, inverted, 9.0 cm behind mirror, 4.2 cm high
3

What is the focal length of a convex spherical mirror which produces an image one-sixth the size of an object located 12 cm from the mirror?
A)1.7 cm
B)-2.4 cm
C)10.3 cm
D)4.0 cm
4

The speed of light in a certain glass is 1.91 x 108 m/s. What is the refractive index of the glass?
A)1.57
B)0.64
C)1.09
D)4.9
5

A beam of light strikes the surface of water at an incidence angle of 60°. Determine the directions of the reflected and refracted rays. For water, n=1.33.
A)(a) 30° reflected into air, (b) 22° refracted into water
B)(a) 60° reflected into air, (b) 41° refracted into water
C)(a) 90° reflected into air, (b) 60° refracted into water
D)(a) 41° reflected into air, (b) 30° refracted into water
6

The critical angle for light passing from rock salt into air is 40.5°. Calculate the index of refraction of rock salt.
A)1.54
B)0.65
C)0.025
D)1.32
7

A luminous object and a screen are 12.5 m apart. What are the position and focal length of the lens which will throw upon the screen an image of the object magnified 24 times?
A)(a) 0.50 m from object, (b) +0.48 m
B)(a) 0.54 m from object, (b) +0.52 m
C)(a) 12.5 m from object, (b) 12.5 m
D)(a) 0.54 m from object, (b) +2.1 m
8

The index of refraction for a certain type of glass is 1.640 for blue light and 1.605 for red light. When a beam of white light (one that contains all colors) enters a plate of this glass at an incidence angle of 40°, what is the angle in the glass between blue and red parts of the refracted beams.
A)0.53°
B)23.075°
C)0.009°
D)46.692°
9

What are the nature and focal length of the lens that will form a real image having one-third the dimensions of an object located 9.0 cm from the lens?
A)diverging, -4.50 cm
B)converging, +2.25 cm
C)converging, +13.5 cm
D)converging, +6.75 cm
10

Describe fully the image of an object which is 10 cm high and 28 cm from a diverging lens of focal length -7.0 cm.
A)virtual, erect, smaller, 5.6 cm in front of lens, 2.0 cm high
B)virtual, inverted, smaller, 9.3 cm in front of lens, 3.3 cm high
C)virtual, erect, larger, 5.6 cm in front of lens, 20.0 cm high
D)real, inverted, smaller, 5.6 cm in front of lens, 2.0 cm high







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