Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 23 - Light: Geometric Optics - Questions - Page 672: 29

Answer

a. A converging lens, made of a pocket of air immersed in water, should be shaped so that it is thinner in the middle than it is at the rim. (This is the shape of a glass diverging lens designed to be used in air.) b. A diverging lens, made of a pocket of air immersed in water, should be shaped so that it is thicker in the middle than it is at the rim. (This is the shape of a glass converging lens designed to be used in air.)

Work Step by Step

In summary, for lenses made of a pocket of air immersed in water, the shapes are the opposite of those of glass lenses designed to be used in air. a. See the top diagram. Air’s index of refraction is lower than that of water's. Light rays speed up and bend away from the normal when entering the lens. The light rays slow down and bend toward the normal when leaving the lens. A converging lens, made of a pocket of air immersed in water, should be shaped so that it is thinner in the middle than it is at the rim. (This is the shape of a glass diverging lens designed to be used in air.) b. See the bottom diagram. Air’s index of refraction is lower than that of water's. Light rays speed up and bend away from the normal when entering the lens. The light rays slow down and bend toward the normal when leaving the lens. A diverging lens, made of a pocket of air immersed in water, should be shaped so that it is thicker in the middle than it is at the rim. (This is the shape of a glass converging lens designed to be used in air.)
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