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physical object > artifact > device > instrument > optical device > detector > spectrograph > diffraction grating spectrograph > Littrow

Littrow comparison table

Subject	has definition	is a kind of
diffraction grating spectrograph		spectrograph
Littrow	The configuration of a diffraction grating spectrograph in which the diffracted ray returns along the same direction as the incident ray.	diffraction grating spectrograph

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