Conceptual Physics (12th Edition)

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

Chapter 29 - Reading Check Questions (Comprehension) - Page 559-560: 9

Answer

A surface is optically flat when the irregularities in its surface are small compared to the wavelength of visible light.

Work Step by Step

The flatness can be tested with another piece of glass. The surfaces are optically flat if the interference bands are regularly spaced and uniform. This is discussed on page 553.
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