White light is shone on a very thin layer of ice n 131 and, Ask an Expert

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White light is shone on a very thin layer of ice (n = 1.31), and above the ice layer, interference maxima for two wavelengths (and no other in between) are seen: one yellow wavelength of 560 nm, and one red wavelength of 670 nm. What is the thickness of the ice layer?

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