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A Michelson interferometer operating at a 400 nmwavelength has a 2.31-cm-long glass cell in one arm....

A Michelson interferometer operating at a 400 nmwavelength has a 2.31-cm-long glass cell in one arm. To begin, the air is pumped out of the cell and mirror M2 is adjusted to produce a bright spot at the center of the interference pattern. Then a valve is opened and air is slowly admitted into the cell. The index of refraction of air at 1.00 atm pressure is 1.00028.

Part A

How many bright-dark-bright fringe shifts are observed as the cell fills with air?

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AVa when V C a ve 2 So)

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