Etendue

English

Etymology

An incandescent lamp. In optics, etendue is a measure of how “spread out” light that crosses, or is emitted by, a surface is, in terms of angle and area.

Borrowed from Template:Bor, short for Template:M.

Pronunciation

• Template:IPA
  • Template:Audio
• Template:IPA
• Template:Rhymes
• Template:Hyphenation

Noun

1. Template:Lb 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.

   Template:Syn

   • Template:Quote-book
   • Template:Quote-book
   • Template:Quote-book

Alternative forms

• Template:L

Translations

• Bulgarian: Template:T
• Finnish: Template:T
• French: Template:T, Template:T
• German: Template:T
• Italian: Template:T