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Reference.org
Monochromator
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<p>A monochromator is an <a href="/facts/Optics/p0vq4S1T">optical</a> device that transmits a mechanically selectable narrow band of <a href="/facts/Wavelength/kcJU0ymz">wavelengths</a> of <a href="/facts/Light/jeofpMn4">light</a> or other <a href="/facts/Radiation/RwMocyeq">radiation</a> chosen from a wider range of wavelengths available at the input. The name is from <a href="/facts/Greek_language/pzDd6eIz">Greek</a> <i> mono-</i> 'single' <i> chroma</i> 'colour' and <a href="/facts/Latin_language/pM3Kge85">Latin</a> <i> -ator</i> 'denoting an agent'. </p>