Conceptual Physics (12th Edition)

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

Chapter 28 - Reading Check Questions (Comprehension) - Page 538-539: 22

Answer

The critical angle is defined to be the minimum angle of incidence at which a light ray is totally reflected, back into the medium.

Work Step by Step

This is discussed on page 531, and shown in Figure 28.37.
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