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 - Exercises - Page 840: 1


In the first case, the waves interfere destructively. And in the second case, the waves interfere constructively.

Work Step by Step

The wavelength $=0.5 m$ So, when the distance is $0.75m$, the path difference is $1.5 lambda$, hence the waves interfere destructively. When the distances differ by $1m$, the path difference is $2lambda$, hence the waves interfere constructively.
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