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physical object > artifact > device > instrument > optical device > wavefront modifier > spectrograph dispersing element > diffraction grating > objective grating

objective grating comparison table

Subject	is a kind of	has definition
diffraction grating	spectrograph dispersing element	An optical device containing thousands of very fine parallel grooves which produce interference patterns in a way which separates out all the components of the light into a spectrum.
objective grating	diffraction grating	A coarse grating placed in front of the telescope objective.

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