An Etymological Dictionary of Astronomy and Astrophysics

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Malus' law
  قانون ِ مالوس  
qânun-e Malus (#)
Fr.: loi de Malus  

If the light wave entering an → analyzer is → linearly polarized, the intensity of the wave emerging from the analyzer is I = k I0 cos2φ,

where k is the coefficient of transmission of the analyzer, I0 is the intensity of the incident light, and φ is the angle between the planes of → polarization of the incident light and the light emerging from the analyzer.

See also: Named after Etienne Louis Malus (1775-1812), French physicist who also discovered polarization by reflection at a glass surface (1808); → law.