Conceptual Physics (12th Edition)

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

Chapter 30 - Think and Explain: 54

Answer

They use the principle of fluorescence.

Work Step by Step

Fabrics and other fluorescent materials look "whiter than white" in sunlight because they not only reflect visible light, but they transform some of the sun’s ultraviolet light into visible light through fluorescence.
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