Monochromator
Optical device / From Wikipedia, the free encyclopedia
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A monochromator is an optical device that transmits a mechanically selectable narrow band of wavelengths of light or other radiation chosen from a wider range of wavelengths available at the input. The name is from the Greek roots mono-, "single", and chroma, "colour", and the Latin suffix -ator, denoting an agent.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/7/73/Light_dispersion_conceptual_waves350px.gif/320px-Light_dispersion_conceptual_waves350px.gif)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/8/88/APS_-_Kohzu_monochromator.jpg/320px-APS_-_Kohzu_monochromator.jpg)