to the eye. The difference in path between these twobeams causes interference fringes to be seen. The fourth glassGH is added because without it one of the interfering beamswould pass through three thicknesses of glass, the other onlythrough one. GH must be of the same thickness as EF andparallel… … MIOHELSON INTERFEROMETER 161 justed, by means of screws provided for that purpose, so thatits image is accurately parallel to CD, we shall have in effectlight reflected from two plane and parallel surfaces, ab andCD, just as in figure 80, with the single exception that whenwe are dealing with a…
Light
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