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Interference of Light: Michelson's Interferometer.

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2). A Michelson interferometer has a vacuum chamber 5.0 cm long placed in one of its arms. The interferometer is illuminated with green laser light of wavelength lambda = 543.5nm. As an unknown gas is let into the vacuum chamber, 200 fringes are counted. (Assume an ideal vacuum initially). What is the index of refraction of the gas as determined by this experiment?

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The refractive index of the gas introduced in the path of one ray in the experiment with Michelson's interferometer is calculated.f

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