Answer
Ray $r_3$ did not undergo a phase shift due to reflection.
Work Step by Step
Ray $r_3$ was transmitted without any reflection, so ray $r_3$ did not undergo a phase shift due to reflection.
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 - Questions - Page 1073: 12a
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