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Etendue - Light Studies
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Created: 11/20/08
Last Edited: 11/20/08
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Etendue or étendue is a property of an optical system, which characterizes how "spread out" the light is in area and angle. The étendue can be defined in several equivalent ways. From the source point of view, it is the area of the source times the solid angle the system's entrance pupil subtends as seen from the source.
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