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You have a Michelson interferometer with a tube full of air placed along one of the...

You have a Michelson interferometer with a tube full of air placed along one of the paths. The length of the tube is 3.00 cm. The mirrors are adjusted until there is a bright fringe using light of wavelength 650 nm. As the air is then pumped out of the tube, how many times does the interference pattern go to dark and back to bright? The index of refraction of air is 1.00028.

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