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A thin layer of colorless oil is spread over water in a container (μ = 1.4)). If the light of wavelength 640 nm is absent in the reflected light, what is the minimum thickness of oil layer?

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A thin layer of colorless oil is spread over water in a container (μ = 1.4)). If the light of wavelength 640 nm is absent in the reflected light, what is the minimum thickness of oil layer?






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