Optical device that transmits a mechanically selectable narrow band of wavelengths of electromagnetic radiation chosen from a wider range of wavelengths available at the input.
To spatially separate the wavelengths, a monochromator can use either the phenomenon of optical dispersion in a prism, or that of @D01711@ using a grating.
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 372 [Terms] [Paper]