Answer
630 nm
Work Step by Step
From Example 24–11, the thickness is related to the most strongly-reflected wavelength by $t=\frac{\lambda}{4n}$.
$$\lambda=4nt=4(1.32)(120nm)=634nm\approx630nm$$
Physics: Principles with Applications (7th Edition)
by Giancoli, Douglas C.
Published by
Pearson
ISBN 10:
0-32162-592-7
ISBN 13:
978-0-32162-592-2
Chapter 24 - The Wave Nature of Light - Problems - Page 709: 44
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