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UPSEE 2018 Solved Paper

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Question : 21

Total: 150

A thin layer of oil (index of refraction 1.5 and thickness 500nm ) floats on the surface of the liquid (index of refraction 1.24). Now, white light is normally incident on the thin film of oil. Of the following, the most reflected wavelength is

500nm
550nm
600nm
650nm

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