Physics Principles and Problems 2009

Chapter 18: Refraction and Lenses

Standardized Test Practice

1
If light passes from air into water at 40.0° to the normal, what is the angle of refraction?
  Need a Hint?
A)28.9°
B)31.3°
C)58.7°
D)61.1°
2
Light passes from air into another medium at 30.0° to the normal. If the angle of refraction is 18.0°, what is the index of refraction of the new medium?
A)1.33
B)1.52
C)1.62
D)2.42
3
What happens when light enters a region with a higher index of refraction?
A)The light slows down and bends toward the normal.
B)The light speeds up and bends toward the normal.
C)The light slows down and bends away from the normal.
D)The light speeds up and bends away from the normal.
4
A light beam passes from flint glass (n = 1.62) into ethanol (n = 1.36). What is the critical angle for total internal reflection of the light beam?
A)15.1°
B)26.0°
C)57.1°
D)84.0°
5
An object is placed in front of a convex lens with a 7.00-cm focal length, If the object distance is 15.0 cm, what is the image distance?
A)2.75 cm
B)4.77 cm
C)8.00 cm
D)13.1cm
6
Which of these describes how a rainbow forms?
A)Light hitting a water droplet is refracted twice, then reflected.
B)Light hitting a water droplet is first refracted, then reflected, then refracted again.
C)Light hitting a prism is refracted twice, then reflected.
D)Light hitting a prism is first refracted, then reflected, then refracted again.
7
Which describes the image produced by a concave lens?
A)reduced and real
B)enlarged and real
C)reduced and virtual
D)enlarged and virtual
8
The diagram below shows rays of light from an object passing through a convex lens. Where will the image form?

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A)on the other side of the lens from the object
B)between the object and the focal point
C)between the object and the lens
D)beyond the object on the same side of the lens
9
The diagram shows how light rays bend when they enter a human eye. Which statement is not true about the eye in the diagram?

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A)It is farsighted.
B)Images focus in front of the retina.
C)The focal length is too short.
D)A concave lens can correct the vision problem.
10
Mike holds a magnifying glass (convex lens) 5.00 cm above a sheet of paper. He looks at the writing on the page and notices that it is magnified by a factor of 3.00. What is the focal length of the lens he is using?
A)7.50 cm
B)3.75 cm
C)4.00 cm
D)2.00 cm
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