Conceptual Physics (12th Edition)

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

Chapter 29 - Think and Explain: 44

Answer

The optical path lengths for the 2 reflected light beams change as the viewing angle is changed. Different colors cancel and reinforce when the path length difference changes, so the dominant color changes when the seashell is turned.

Work Step by Step

This is discussed on pages 553-554.
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