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A plane wave of monochromatic light fall...

A plane wave of monochromatic light falls normally on a uniform thin or oil which covers a glass plate. The wavelength of source can be varied continuously. Complete destructive is observed for `lambda = 5000 Å` and `lambda = 1000 Å` and for no other wavelength in between. If `mu` of oil is 1.3 and that of glass is 1.5, the thickness of the film will be

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