Physics: Principles with Applications (7th Edition)

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

Chapter 24 - The Wave Nature of Light - Problems - Page 708: 18

Answer

1.2% slower

Work Step by Step

Relate the speed of light in silicate flint glass to c by using the index of refraction, v=c/n. Calculate the percent difference by which the blue light (“b”) is slower than red light (“r”). Your answer may vary if you read the graph (Figure 24-14) differently. $$\frac{v_b-v_r}{v_r}=\frac{c/n_b-c/n_r}{c/n_r}$$ $$\frac{ n_r- n_b}{ n_b}=\frac{ 1.62- 1.64}{1.64}=-1.2\%$$ Blue light travels about 1.2 percent slower in silicate flint glass than red light does.
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