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Question: 

If a soap bubble is 120 nm thick, what wavelength is most strongly reflected at the center of the outer surface when illuminated normally by white light? Assume that n = 1.32.

Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014. Reprinted by permission of Pearson Education Inc., New York.
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Quick Answer: 

630 nm

Giancoli 7th Edition, Chapter 24, Problem 44

(3:27)

Chapter 24, Problem 44 is solved.

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