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Photonics Dictionary

point light source

1. With respect to angular subtense, a source of light, such as a star, that is very small. In a lab, a point source may be simulated by imaging a large source onto and through a pinhole, or by focusing a parallel bundle of light, such as that from a laser, with a precise lens to a point image. 2. In lens design, a fictitious infinitely small source of radiation.
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