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1006_Physics ProblemsTechnical Physics

1006_Physics ProblemsTechnical Physics - Chapter 36 Q36.8...

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Chapter 36 347 Q36.8 We assume the lens has a refractive index higher than its surroundings. For the biconvex lens in Figure 36.27(a), R 1 0 > and R 2 0 < . Then all terms in n RR −− F H G I K J 1 11 12 af are positive and f > 0. For the other two lenses in part (a) of the figure, R 1 and R 2 are both positive but R 1 is less than R 2 . Then > and the focal length is again positive. For the biconcave lens and the plano-concave lens in Figure 36.27(b), R 1 0 < and R 2 0 > . Then both terms are negative in and the focal length is negative. For the middle lens in part (b) of the figure, R 1 and R 2 are both positive but R 1 is greater than R 2 . Then < and the focal length is again negative. Q36.9 Both words are inverted. However OXIDE has up-down symmetry whereas LEAD does not. Q36.10 An infinite number. In general, an infinite number of rays leave each point of any object and travel in all directions. Note that the three principal rays that we use for imaging are just a subset of the infinite number of rays. All three principal rays can
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