College Physics (7th Edition)

Published by Pearson
ISBN 10: 0-32160-183-1
ISBN 13: 978-0-32160-183-4

Chapter 24 - Physical Optics: The Wave of Nature of Light - Learning Path Questions and Exercises - Conceptual Questions - Page 839: 5

Answer

It is always dark because of the destructive interference. This is because of the $180^{\circ}$ phase shift. If there had not been the $180^{\circ}$ phase shift, zero thickness would have corresponded to constructive interference.

Work Step by Step

It is always dark because of the destructive interference. This is because of the $180^{\circ}$ phase shift. If there had not been the $180^{\circ}$ phase shift, zero thickness would have corresponded to constructive interference.
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