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===Prisms===
[[File:Reflecting prism monochromator,internal structure,Mar 2017.jpg|thumb|right|200px|
Prisms have higher dispersion in the [[UV]] region. Prism monochromators are favored in some instruments that are principally designed to work in the far UV region. Most monochromators use gratings, however. Some monochromators have several gratings that can be selected for use in different spectral regions. A double monochromator made by placing a prism and a grating monochromator in series typically does not need additional bandpass filters to isolate a single grating order.
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