Conceptual Physics (12th Edition)

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

Chapter 28 - Reading Check Questions (Comprehension): 29

Answer

When the pupils are very small, light only passes through the central part of the lens.

Work Step by Step

The chromatic and spherical aberrations are minimal at the center of the lens, so only using the center means that vision will be the sharpest. Also, the eye acts more like a pinhole camera, and less focusing is required. This is discussed on page 537, and shown in Figures 28.52 and 28.54.
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