Modified True/False
Indicate
whether the sentence or statement is true or false. If false, change the identified word or
phrase to make the sentence or statement true.
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1.
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A
transparent material absorbs light. _________________________
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2.
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A
virtual image is formed where light rays meet at a point.
_________________________
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3.
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A
mirage is caused by reflection as light passes through layers of air at different
temperatures. _________________________
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4.
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A
convex lens is thicker in the center than at its edges.
_________________________
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5.
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A
white carpet will appear red when viewed through a red filter because the filter absorbs red
light only. _________________________
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6.
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A
secondary color of light is produced by mixing three primary colors together.
_________________________
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7.
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To
focus light, muscles in the eye change the length and thickness of the retina.
_________________________
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8.
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Nearby objects appear blurry to a person who is farsighted.
_________________________
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9.
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The
eyepiece of a telescope or microscope magnifies an image.
_________________________
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10.
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Light
waves that are in step, or have crests aligned with crests, are said to be focused.
_________________________
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Essay
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11.
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Compare and contrast regular and diffuse reflection.
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12.
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You
look at your reflection on the inner surface of a spoon held about 30 centimeters away. Then you turn
the spoon around and look at the reflection on the back of the spoon. Compare and contrast the two
images.
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13.
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Suppose a ray of light strikes a block of clear ice at an angle of 40°. A similar
ray strikes a block of glass at the same angle. If the light ray is bent less in ice, which material
has the greater index of refraction? Explain.
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14.
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What
is the only type of image that can be formed by both a concave lens and a convex lens? For each lens,
explain the position of the object relative to the lens that will produce that type of
image.
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15.
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A
piece of cloth appears red under red light, green under green light, and blue under blue light. What
color is the cloth? Explain why it cannot be any other color.
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16.
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Explain what happens to the shape of the eye lens when the muscles that control it
contract. What happens when they relax?
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17.
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Explain how lasers are used to record information on a compact disc. How is the
information then retrieved from the disc?
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18.
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Describe two uses of optical fibers.
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