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Chapter 5: Q58E (page 1154)
You want to view through a magnifier an insect that is 2.00 mm long. If the insect is to be at the focal point of the magnifier, what focal length will give the image of the insect an angular size of 0.032 radian?
The focal length of the magnifier should be6.25 cm.
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If you sit on the beach and look at the ocean through Polaroid sunglasses, the glasses help to reduce the glare from sunlight reflecting off the water. But if you lie on your side on the beach, there is little reduction in the glare. Explain why there is a difference.
The image of a tree just covers the length of a plane mirror tall when the mirror is held 35cm from the eye. The tree is 28m from the mirror. What is its height?
A salesperson at a bargain counter claims that a certain pair of sunglasses has Polaroid filters; you suspect that the glasses are just tinted plastic. How could you find out for sure?
Explain why the focal length of a plane mirror is infinite, and explain what it means for the focal point to be at infinity.
A spherical air bubble in water can function as a lens. Is it a converging or diverging lens? How is its focal length related to its radius?
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