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etalon


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Two parallel glass plates with reflecting surfaces between which light is reflected numerous times before exiting. The effect of interference produces an outgoing beam that contains only a limited range of wavelengths, as in an interference filter. Etalons in which the gap between the plates can be varied to select different wavelengths are used in a Fabry–Perot interferometer.

Subjects: Astronomy and Astrophysics.


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