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Instrument: FPI : Fabry-Perot Interferometer
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The Fabry-Perot Interferometer (FPI) makes use of multiple
reflections between two closely spaced partially silvered
surfaces. Part of the light is transmitted each time the light
reaches the second surface, resulting in multiple offset beams
which can interfere with each other. The large number of
interfering rays produces an interferometer with extremely high
resolution, somewhat like the multiple slits of a diffraction
grating increase its resolution.

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[Summary provided by Hyper Physics]