Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 25 - Optical Instruments - Questions: 2


Only more parallel rays hit the center part of the lens.

Work Step by Step

At a larger f-number, the opening in the iris diaphragm is smaller. Only light rays hitting the central part of the lens are used to make the image, and these rays are more parallel than if a larger opening (smaller f-number) were used. These more parallel rays create smaller circles of confusion (as discussed on page 716). Objects over a greater range of distances will be in focus.
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