A Michelson interferometer uses a helium-neon laser with
Chapter 33, Problem 33.18(choose chapter or problem)
A Michelson interferometer uses a helium-neon laser with wavelength lvac = 633 nm. In one arm, the light passes through a 4.00-cm-thick glass cell. Initially the cell is evacuated, and the interferometer is adjusted so that the central spot is a bright fringe. The cell is then slowly filled to atmospheric pressure with a gas. As the cell fills, 43 bright-dark-bright fringe shifts are seen and counted. What is the index of refraction of the gas at this wavelength?
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