Conceptual Physics (12th Edition)

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

Chapter 28 - Think and Explain: 85

Answer

The photosensitive surface should be placed one focal length behind the lens to form images of very distant objects.

Work Step by Step

For very distant objects, the lights rays are coming in almost parallel. As shown in Figure 28.43a, for objects located at "infinity", light rays focus at the focal point of the lens. For objects that are closer, the photosensitive surface should be placed farther from the lens. The same conclusions are drawn from the thin lens equation, discussed in the footnote at the bottom of page 535.
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