etendue
A conserved property of the light in an optical system which characterizes how "spread…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.
Meaning
1 senses(uncountable)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.
Etendue
Translations
4 languagesBy meaning 1
Origin
Borrowed from French étendue (“area, expanse; size; extent, range, scale”), short for étenBorrowed from French étendue (“area, expanse; size; extent, range, scale”), short for étendue géométrique (“geometric extent”).
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Synonyms
8 synonymsLessons for this word
1 lessons- A1Countable and uncountable nouns — Because it can be uncountable