Answer
The paper reflects every wavelength of visible light that falls upon it.
Work Step by Step
It appears white in sunlight because it doesn't absorb at any wavelength. If illuminated by, say, red light, it reflects all of it, and appears red.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 27 - Think and Explain - Page 517-518: 41
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