Answer
Diffraction explains how ridges in the surface layers of their feathers give them color.
Work Step by Step
At the bottom of page 551, it is explained that the tiny grooves of the feathers act as diffraction gratings.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 29 - Think and Explain - Page 560-561: 42
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