Answer
$\Delta L = 1.75~\mu m$
Work Step by Step
We can find the path length difference corresponding to the fourth dark band:
$\Delta L = (m+0.5)~\lambda$
$\Delta L = (3+0.5)(500~nm)$
$\Delta L = 1.75~\mu m$
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 1080: 95a
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