Conceptual Physics (12th Edition)

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

Chapter 27 - Think and Explain: 48

Answer

A ripe banana will appear black when illuminated by blue light.

Work Step by Step

Blue is the complementary color to yellow. Blue + yellow = white. Under normal illumination, the banana absorbs the complementary color to yellow (which is blue), reflecting yellow light. The banana appears black when illuminated by blue light, because the fruit absorbs that light, and there is no "yellow" light to reflect. This is discussed on pages 505-506 and 509-511.
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