| Definition: | property of a quantity, X, pertaining to electromagnetic radiation that indicates that X is a function of the wavelength, λ Note 1 to entry: The quantity X can also be expressed as a function of frequency, ν, wavenumber, σ, etc.; the corresponding symbols are X(ν), X(σ), etc. and Xν, Xσ, etc. See also "spectral distribution". Note 2 to entry: This entry was numbered 845-01-16 in IEC 60050-845:1987.
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