Monochrome comes from the two
Greek words mono (μoνο, meaning "only" or "alone"), and chroma (χρωμα, meaning "colour"). A monochromatic object has a single
colour.In
physics, the word is used more generally to refer to
electromagnetic radiation of a single
wavelength. In the physical sense, no real source of electromagnetic radiation is purely monochromatic, since that would require a
wave of infinite duration. Even sources such as
lasers have some narrow range of wavelengths (known as the linewidth or
bandwidth of the source) within which they operate. In practice, filtered light,
diffraction grating separated light and laser light are all routinely referred to as monochromatic. Often light sources can be compared and one be labeled as "more monochromatic" (in a similar usage as monodispersity). And a device which isolates light sources of a narrow bandwidth are called
monochromators, even though the bandwidth is often explicitly specified, and thus a collection of wavelengths is understood.
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light of a single wavelength or very narrow bandwidth. Monochromatic light is made up of a single color of light.
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