Polychromator

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A polychromator is an optical device that is used to disperse light into different directions to isolate parts of the spectrum of the light. A prism or diffraction grating can be used to disperse the light. Unlike a monochromator, it outputs multiple beams over a range of wavelengths. Polychromators are often used in spectroscopy. However, they are generally referred to by the more generic term spectrograph.