Answer
$x_p = 0$
Work Step by Step
If $x_p = 0$, then by symmetry, the path length difference is zero.
Then the phase difference is zero.
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 35 - Interference - Problems - Page 1075: 24a
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