Conceptual Physics (12th Edition)

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

Chapter 28 - Reading Check Questions (Comprehension) - Page 538-539: 30


Astigmatism is a defect where the lens of the eye is not spherical, i.e., it is more curved in one direction than another. It can be corrected with lenses whose curvature also varies with direction.

Work Step by Step

Visualizing the side of a barrel may help you picture an astigmatic lens, which is more curved in one direction than another. A section cut from a barrel side has a small, sharp radius of curvature around a vertical axis, and a more gentle curvature around a horizontal axis. This is discussed on page 537.
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