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of the light, its polarization, and the angle of incidence. The dependence of reflectance on the wavelength is called a reflectance spectrum or spectral reflectance curve.

Mathematical definitions

Hemispherical reflectance

The hemispherical reflectance of a surface, denoted , is defined as

where is the radiant flux reflected by that surface and is the radiant flux received by that surface.

Spectral hemispherical reflectance

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