College Physics (7th Edition)

Published by Pearson
ISBN 10: 0-32160-183-1
ISBN 13: 978-0-32160-183-4

Chapter 22 - Reflection and Refraction of Light - Learning Path Questions and Exercises - Exercises - Page 774: 14


a). (3) less than the angle of incidence. b). $35.17^{\circ}$

Work Step by Step

a). As light travels into a denser medium, the light ray bends towards the normal. So (3) is the answer. b). By Snell's law :- $n_{1}sin\theta_{i}=n_{2}sin\theta_{r}$ Now, $n_{1}=1$, for air $n_{2}=1.33$, for water and $\theta_{i}=50^{\circ}$ Thus, $\theta_{r}=sin^{-1}(\frac{1\times sin50^{\circ}}{1.33})=35.17^{\circ}$
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