etendue

Noun

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.

Origin / Etymology

Borrowed from French étendue (“area, expanse; size; extent, range, scale”), short for étendue géométrique (“geometric extent”).

Synonyms

AΩ product, acceptance, geometric extent, light grasp, light-collecting power, light-gathering power, optical extent, throughput

Scrabble Score: 0

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etendue: not valid in Scrabble (MW) Merriam-Webster Dictionary
etendue: not valid in International Collins CSW Dictionary

Words With Friends Score: 0

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