Conceptual Physics (12th Edition)

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

Chapter 9 - Think and Do: 32

Answer

This is a hands-on demonstration. Try it and see! You will find that when you hold the one-quarter-area bill at half the distance from your eye as you hold the full-area bill, they appear to have the same angular size, and cover equal areas. This demonstrates the inverse-square law.
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