A Winston cone is a non-imaging light collector in the shape of an off-axis parabola of revolution with a reflective inner surface. It concentrates the light passing through a relatively large entrance aperture through a smaller exit aperture.
A Winston cone is a non-imaging light collector in the shape of an off-axis parabola of revolution with a reflective inner surface. It concentrates the light passing through a relatively large entrance aperture through a smaller exit aperture.
Source: Wikipedia "Winston cone" · CC BY-SA 4.0
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