etendue

Etymology


Borrowed from, short for.

Noun

 * 1)  A conserved property of the light in an optical system which characterizes how "spread out" the light is in terms of angle and area: it is the product of its cross-sectional area (normal to the direction of propagation) and the solid angle it subtends.

Translations

 * Bulgarian: геометричен фактор
 * Finnish: akseptanssi
 * French: étendue de faisceau, étendue géométrique
 * German: Etendue
 * Italian: accettanza