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The index of refraction of a glass rod is 1.48 at T = 20.0°C and varies linearly with temperature, with a coefficient of 2.50 x l0-5/Co. The coefficient of linear expansion of the glass is 5.00 x l0-6/Co. At 20.0oC the length of the rod is 3.00 cm. A Michelson interferometer has this glass rod in one arm, and the rod is being heated so that its temperature increases at a rate of 5.00Co/min. The light source has wavelength is = 589 nm, and the rod iuitially is at T = 20.0oC. How many fringes cross the field of view each minute?

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