etendue
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etendue
- /ˌeɪ.tɒnˈd(j)uː/ UK
- /ˌeɪ.tɑnˈdu/ US
Rhymes with -uː
Where it comes from
Borrowed from French étendue (“area, expanse; size; extent, range, scale”), short for étendue géométrique (“geometric extent”).
noun étendue
-
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.
The topics include […] carefully outlining the concepts of etendue, finesse, and their theoretical implications; methods of spectral, spatial, temporal, and polarization discrimination; and application of these topics to search and track systems.
Similar: AΩ product, acceptance, geometric extent, light-collecting power, light-gathering power, light grasp, optical extent, throughput
Translations
Every language
noun conserved property of the light in an optical system
| Français | étendue de faisceau, étendue géométrique |
|---|---|
| Deutsch | Etendue |
| Italiano | accettanza |
Talk about this word "etendue." Wiktionary, via Micwyn, micwyn.com/word/etendue. Accessed 6 Nov. 2026. etendue. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/etendue "etendue." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/etendue.Cite this
@misc{etendue_2026,
title = {etendue},
howpublished = {Wiktionary, via Micwyn},
year = {2026},
url = {https://micwyn.com/word/etendue},
urldate = {2026-11-06}
}
