Albert Michelson 20-foot Interferometer

goal was to adjust the light path lengths so that the band of brightest fringes would be carried to the eyepiece of the observer. It was easier to adjust the light path lengths and move the fringes to a fixed eyepiece than to move the observer to a fixed fringe location. This concept was also used in later interferometers. The fringes would be located manually by an observer. Once located, the relative fringe brightness was noted. Then the outer two mirrors would be moved apart and ...

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