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physical object > artifact > device > instrument > optical device > wavefront modifier > spectrograph dispersing element > Fabry-Perot interferometer
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Fabry-Perot interferometer comparison table
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etalon or center of gravity  Fabry-Perot interferometer    FP     Essentially an optical filter that operates by multiple-beam interference of light reflected and transmitted by a pair of parallel flat reflecting plates. wavelength 

Next spectrograph dispersing elementinterference filter    Upspectrograph dispersing element    Previous spectrograph dispersing elementdiffraction grating