Concept

Reflectance

Summary
The 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 the boundary. Reflectance is a component of the response of the electronic structure of the material to the electromagnetic field of light, and is in general a function of the frequency, or wavelength, 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 R, is defined as R = \frac{\Phi_\mathrm{e}^\mathrm{r}}{\Phi_\mathrm{e}^\mathrm{i}}, where Φer is the radiant flux reflected by that surface and Φei is the radiant flux received by that surface. Spectral hemispherical reflectance The spectral hemispherical reflectance in frequency
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