Theory In physics , the word `` monochromatic '' is used more generally to refer to electromagnetic radiation of a single wavelength .

Monochrome comes from the two MISC@1 words mono -LRB- meaning `` one '' -RRB- and chroma -LRB- meaning `` surface '' or `` the colour of the skin '' -RRB- . In physics , the word is used when talking about electromagnetic radiation of a single wavelength .
