Answer
The mirror should be moved in (shorter path length).
Work Step by Step
Since the number of wavelengths traveled in the arm with the vessel increases, we must decrease the number of wavelengths traveled in the other arm.
College Physics (4th Edition)
by Giambattista, Alan; Richardson, Betty; Richardson, Robert
Published by
McGraw-Hill Education
ISBN 10:
0073512141
ISBN 13:
978-0-07351-214-3
Chapter 25 - Section 25.2 - The Michelson Interferometer - Conceptual Practice Problem - Page 949: 25.2
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