TERMIUM Plus^®

Fiche 1,  Justifications,  Anglais

Record number: 1, Textual support number: 1 DEF

"cosine law": either of two laws of radiation: a: the radiant flux emitted in a given direction from a given small area of a perfectly diffusing surface varies as the cosine of the angle of emission. b: the irradiation by parallel rays falling on a surface varies as the cosine of the angle of incidence.  1, fiche 1, Anglais, - cosine%20law

Record number: 1, Textual support number: 1 CONT

The reflection of point sources of light by matte, or diffuse, surfaces (those that scatter light equally in all directions) is modeled by Lambert's cosine law which states that intensity varies as the cosine of the angle between the direction of the light source and a vector perpendicular to the surface, called the surface normal.  5, fiche 1, Anglais, - cosine%20law

Record number: 1, Textual support number: 2 CONT

"cosine emission law" [states that] the energy emitted by a radiating surface in any direction is proportional to the cosine of the angle which that direction makes with the normal.  4, fiche 1, Anglais, - cosine%20law

Fiche 1,  Justifications,  Français

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Nous n'avons pu l'attester dans les ouvrages généraux et spécialisés de langue française que nous possédons.  3, fiche 1, Français, - loi%20de%20Lambert

Fiche 1,  Justifications,  Espagnol

Fiche 2,  Justifications,  Anglais

Record number: 2, Textual support number: 1 DEF

"Bouguer law": The law discovered by Bouguer in 1729, that the absorption of light in homogeneous materials depends on thickness according to the exponential expression given under absorption coefficient.  1, fiche 2, Anglais, - Bouguer%20law

Record number: 2, Textual support number: 1 OBS

The law was rediscovered by Lambert and is often referred to as the Lambert law of absorption. It is also related to the Beer law, which is obtained by setting the absorption coefficient a = a[alpha]c. When the law is expressed in terms of common logarithms: I = I₀10^{- kx}, "k" is known as the extinction coefficient. These laws may be applied to a narrow band of wavelengths, giving the specular coefficient of absorption or the specular extinction coefficient according to the form of the equation used.  1, fiche 2, Anglais, - Bouguer%20law

Fiche 2,  Justifications,  Français

Record number: 2, Textual support number: 1 DEF

"loi de Bouguer" : Loi exprimant l'absorption exponentielle de la lumière par une substance colorée; reprise par Lambert et Beer.  5, fiche 2, Français, - loi%20de%20Bouguer

Fiche 2,  Justifications,  Espagnol