39. (I) When a transparent sheet of thickness 2 µm is inserted into one arm of a Michelson-Morle

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39. (I) When a transparent sheet of thickness 2 µm is inserted into one arm of a Michelson-Morley interferometer, there is a fringe shift of 5 fringes. If the wavelength used is 600 nm, what is the refractive index of the sheet?