grating spectrometer

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An instrument that uses a diffraction grating to disperse light into a spectrum. Gratings may be placed at the focus of a telescope (a focal-plane spectrometer) or in front of a telescope (an objective spectrometer). Grating spectrometers are used for spectroscopy at wavelengths from X-rays to the far infrared.

Subjects: Astronomy and Astrophysics.

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