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

diffraction grating spectrograph
subject			fact

diffraction grating spectrograph	is a kind of spectrograph
spectrograph	has synonym spectrometer
instrument	has operator
artifact	has creator
	has creation date
	has purpose
	has owner
physical object	has location or center of gravity
	has angular momentum
	has mass
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

Kinds of diffraction grating spectrograph :

• HRS (2 facts) - High-Resolution Spectrograph (Hubble).
• Littrow (2 facts) - The configuration of a diffraction grating spectrograph in which the diffracted ray returns along the same direction as the incident ray.

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