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Chapter 34: Q. 77 (page 994)
A tall object is placed in front of a mirror. A tall upright image is formed behind the mirror, from the object. What is the focal length of the mirror?
The focal length of the mirror is.
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An underwater diver sees the sunabove horizontal. How high is the sun above the horizon to a fisherman in a boat above the diver?
An object is in front of a convex mirror with a focal length of . Use ray tracing to locate the image. Is the image upright or inverted?
A concave mirror brings the sun's rays to a focus in front of the mirror. Suppose the mirror is submerged in a swimming pool but still pointed up at the sun. Will the sun's rays be focused nearer to, farther from, or at the same distance from the mirror? Explain.
Suppose you have two pinhole cameras. The first has a small round hole in the front. The second is identical except it has a square hole of the same area as the round hole in the first camera. Would the pictures taken by these two cameras, under the same conditions, be different in any obvious way? Explain.
A biologist keeps a specimen of his favorite beetle embedded in a cube of polystyrene plastic. The hapless bug appears to be within the plastic. What is the beetle's actual distance beneath the surface?
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