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.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 9 - Think and Discuss - Page 180-181: 95
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