Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 28 - Reading Check Questions (Comprehension): 23

Answer

About $43^{\circ}. 24.5^{\circ}$.

Work Step by Step

The critical angle is defined to be the minimum angle of incidence at which a light ray is totally reflected, back into the medium. For glass in air, the critical angle is about $43^{\circ}$, depending on the particular type/composition of glass. For a diamond in air, the critical angle is $24.5^{\circ}$. This is discussed on pages 532-533.
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