How many fringes
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A rectangular glass chamber is inserted into one arm of a Michelson interferometer using a 633-nm light source. This chamber is 5.401 cm long, and initially it is filled with air n=1.000293 at standard atmospheric pressure.
The air is gradually pumped out using a vacuum pump until a nearly perfect vacuum is achieved. How many fringes are observed moving past a fixed point on the screen during the transition? (An integer answer is required.)
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