One of the beams of an interferometer (Fig. 24-61) passes through a small evacuated glass container 1.155
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One of the beams of an interferometer (Fig. 24-61) passes through a small evacuated glass container 1.155 cm deep. When a gas is allowed to slowly fill the container, a total of 158 dark fringes are counted to move past a reference line. The light used has a wavelength of 632.8 nm. Calculate the index of refraction of the gas at its final density, assuming that the interferometer is in vacuum.
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