Reflectivity

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Reflectivity is a term in radiometry. It is the ratio between the exitance from the front of a surface and the incident irradiance on the front.

r_\lambda = \frac{M_{front,\lambda}}{E_{front,\lambda}}

Note that reflectivity is a unitless quantity in the range [0,1]. It normally varies as a function of wavelength. Reflectivity does not capture the angular dependence of the reflected energy; that is characterized by a BRDF.

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