Monochromatic radiation

In physics, monochromatic radiation is electromagnetic radiation with a single constant frequency or wavelength.^[1] When that frequency is part of the visible spectrum (or near it) the term monochromatic light is often used. Monochromatic light is perceived by the human eye as a spectral color.

When monochromatic radiation propagates through vacuum or a homogeneous transparent medium, it remains with a single constant frequency or wavelength; otherwise, it suffers refraction.

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