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Question
An oil slick on water is 120 nm thick and illuminated by white light incident perpendicular to its surface. What color does the oil appear (what is the most constructively reflected wavelength), given its index of refraction is 1.40?
Question by OpenStax is licensed under CC BY 4.0.
Final Answer
$672 \textrm{ nm}$
This is the color red.
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OpenStax College Physics Solution, Chapter 27, Problem 71 (Problems & Exercises) (6:04)

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