Conceptual Physics (12th Edition)

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

Chapter 27 - Think and Explain: 42

Answer

The beam is blue.

Work Step by Step

Blue is the complementary color to yellow. Blue + yellow = white. If the coating won't transmit yellow light, the light that comes out is blue, the complementary color. White - yellow = blue. This is discussed on pages 509-511.
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