Conceptual Physics (12th Edition)

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

Chapter 28 - Think and Explain: 50

Answer

Three.

Work Step by Step

Three plane mirrors produce the multiple images of the person. This is a kaleidoscope, and the edges of the 3 mirrors are visible in the photo.
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