A gas cell of length 50 mm is placed in one arm of a Michelson interferometer, with a mercury vapour lamp providing illumination at a wavelength of 546 nm. By changing the gas cell pressure, the fringe pattern is observed to traverse 197 complete fringes. What is the change in the refractive index of the gas?

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A gas cell of length 50 mm is placed in one arm of a Michelson interferometer, with a
mercury vapour lamp providing illumination at a wavelength of 546 nm. By changing the
gas cell pressure, the fringe pattern is observed to traverse 197 complete fringes. What is
the change in the refractive index of the gas?
Transcribed Image Text:A gas cell of length 50 mm is placed in one arm of a Michelson interferometer, with a mercury vapour lamp providing illumination at a wavelength of 546 nm. By changing the gas cell pressure, the fringe pattern is observed to traverse 197 complete fringes. What is the change in the refractive index of the gas?
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