Film of oil covers the surface of a glass of water

Reference no: EM13650230

A thin film of oil covers the surface of a glass of water. White light is incident on the top surface. A red spot is observed when viewed normal to the surface. If the wavelength of the red light in air is 689 nm and the indices of refraction of the oil and water are 1.45 and1.33, respectively, then what is the minimum thickness of the layer of oil?

Reference no: EM13650230

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