Reflectivity: Difference between revisions
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imported>David E. Volk m (bold title) |
imported>Mark Widmer (Added remarks on percent, completely transparent, and perfect mirror.) |
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'''Reflectivity''' is a term in [[radiometry]]. | '''Reflectivity''' is a term in [[radiometry]]. It is the ratio between the [[Irradiance|exitance]] from the front side of a surface and the incident [[irradiance]] on the front side. | ||
<math> | <math> | ||
r_\lambda = \frac{M_{front,\lambda}}{E_{front,\lambda}} | r_\lambda = \frac{M_{front,\lambda}}{E_{front,\lambda}} | ||
</math> | </math> | ||
Note that reflectivity is a unitless quantity in the range [0,1], and can also be expressed as a percentage in the range [0%,100%]. A completely transparent surface has a reflectivity of 0%, while a perfect mirror has a reflectivity of 100%. Reflectivity normally varies as a function of wavelength. | |||
Reflectivity does not capture the angular dependence of the reflected energy; that is characterized by a [[Bidirectional reflectance distribution function|BRDF]]. | |||
Revision as of 16:00, 25 January 2022
Reflectivity is a term in radiometry. It is the ratio between the exitance from the front side of a surface and the incident irradiance on the front side.
Note that reflectivity is a unitless quantity in the range [0,1], and can also be expressed as a percentage in the range [0%,100%]. A completely transparent surface has a reflectivity of 0%, while a perfect mirror has a reflectivity of 100%. Reflectivity normally varies as a function of wavelength.
Reflectivity does not capture the angular dependence of the reflected energy; that is characterized by a BRDF.