Conceptual Physics (12th Edition)

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

Chapter 29 - Think and Explain - Page 560-561: 45

Answer

The improper washing leaves an iridescent film of soap on the dishes. The color is caused by interference of light reflecting from the upper and the lower surfaces of the soap film.

Work Step by Step

This is discussed on pages 553-554, and shown in Figure 29.26.
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