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A plane wave of monochromatic light falls normally on a uniform thin film of oil which covers a glass plate. The wavelength of sources can be varied continuously. Complete destructive refraction is observed for λ=5000˙A and λ=7000˙A and for no other wavelength in between. If μ of oil is 1.3 and that of glass is 1.5, the thickness of the film will be

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A plane wave of monochromatic light falls normally on a uniform thin film of oil which covers a glass plate. The wavelength of sources can be varied continuously. Complete destructive refraction is observed for λ=5000˙A and λ=7000˙A and for no other wavelength in between. If μ of oil is 1.3 and that of glass is 1.5, the thickness of the film will be





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