Problem a very thin oil film n 125 floats on water n 133, Ask an Expert

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Problem: A very thin oil film (n = 1.25) floats on water (n = 1.33). What is the thinnest film that produces a strong reflection for green light with a wavelength of 500 nm?

Will only reward points with complete work show your working, I don't understand how to solve problems with producing strong reflection.

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