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A thin film of oil of refractive index1.2 is spread over water of refractive index 1.3 The thickness of oil film is 2*10 -7 m calculate the wavelenth from visible region that will be absent from reflected light when viewed such that the angle of reflection in the film 60 degree.

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A thin film of oil of refractive index1.2 is spread over water of refractive index 1.3 The thickness of oil film is 2*10 -7 m calculate the wavelenth from visible region that will be absent from reflected light when viewed such that the angle of reflection in the film 60 degree.​

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A thin film of oil of refractive index1.2 is spread over water of refractive index 1.3 The thickness of oil film is 2*10 -7 m calculate the wavelenth from visible region that will be absent from reflected light when viewed such that the angle of reflection in the film 60 degree.