Reflectance of the surface of a material is its effectiveness in reflecting radiant energy. It is the fraction of incident electromagnetic power that is reflected at an interface. The reflectance spectrum or spectral reflectance curve is the plot of the reflectance as a function of wavelength.

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


The spectral hemispherical reflectance in frequency and spectral hemispherical reflectance in wavelength of a surface, denoted Rν and Rλ respectively, are defined as


The directional reflectance of a surface, denoted RΩ, is defined as

This page was last edited on 12 April 2018, at 16:47 (UTC).
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