Light of wavelength λ falls at normal incidence from air upon a plastic film of thickness d, coated on glass. The refractive index of the plastic film is n2 , and that of glass is n3 , where n2 > n3 > nair. Find the minimum thickness of plastic to obtain a bright spot when viewed from the top.
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Light of wavelength λ falls at normal incidence from air upon a plastic film of
thickness d, coated on glass. The refractive index of the plastic film is n2 , and that of glass is n3 , where n2 > n3 > nair. Find the minimum thickness of plastic to obtain a bright spot when viewed from the top.
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