Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)

Published by Pearson
ISBN 10: 0133942651
ISBN 13: 978-0-13394-265-1

Chapter 33 - Wave Optics - Stop to Think 33.5 - Page 951: 1

Answer

D. 4

Work Step by Step

Moving M1 in by a decrease r1 by 2λ. Moving M2 out by λ increases r2 by 2λ. These two actions together change the path length by Δr =4λ.
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