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glossary

Grey body: body emitting radiations in constant proportion to the black body at the same temperature but with an emissivity lower than 1
Wavelength ( of a light wave ): distance between two consecutive identical states of the electric ( or magnetic ) field
Spectrum: contribution of the monochromatic components of a wave on a phenomenon (emission, detection, absorption, transmission, etc.), as a function of the wavelength (or frequency) of its components