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Definition of Etendue
1. Noun. (physics) a property of the light in an optical system; the product of its cross-sectional area (normal to the direction of propagation) and the solid angle it subtends. ¹
¹ Source: wiktionary.com
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1. Noun. (physics) a property of the light in an optical system; the product of its cross-sectional area (normal to the direction of propagation) and the solid angle it subtends. ¹
¹ Source: wiktionary.com