Michelson A. A. Light waves and their uses (1903)

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Microscope, Telescope, Interferometer 37

ence in the path of the two pencils is not too great, and provided that the two pencils are reunited at a sufficiently small angle. By altering these conditions of reflection or

38 Light Waves and Theib Uses

refraction we may obtain a very considerable number of variations of form, as illustrated in Figs. 34, 35.

One of these types, enlarged in Fig. 36, has been arranged