One leg of a michelson interferometer contains an evacuated cylinder of length l, having glass plates on each end. a gas is slowly leaked into the cylinder until a pressure of 1 atm is reached. if n bright fringes pass on the screen when light of wavelength λ is used, provide an expression for the index of refraction of the gas?
hint: the fringe shifts occur because the wavelength of the light changes inside the gas-filled tube.
Answers: 1
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