Conceptual Physics (12th Edition)

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

Chapter 9 - Think and Discuss: 95

Answer

If one is 3 m from the collimated light source, the light spreads over $9 m^{2}$. At a distance of 5 m,the light covers $25 m^{2}$, and at 10 meters, the light covers $100 m^{2}$ . Please see Figure 9.5 on page 164.
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