English Explanatory Dictionary

etendue

English dictionary entry

Meanings

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.

Pronunciation

/ˌeɪ.tɒnˈd(j)uː/ LL-Q1860 (eng)-Vealhurl-etendue.wav /ˌeɪ.tɑnˈdu/

Word forms

etendue étendue

Etymology

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

Synonyms

AΩ product acceptance geometric extent light-collecting power light-gathering power light grasp optical extent throughput
This entry uses open data from Wiktionary (CC BY-SA/GFDL). Word forms are used for search and are not indexed as separate pages.
Back to search All on E Russian dictionary Dahl dictionary