point source

noun Physics, Optics.
a source of radiation sufficiently distant compared to its length and width that it can be considered as a point.


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World English Dictionary
point source
optics a source of light or other radiation that can be considered to have negligible dimensions

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

point source n.
A source, especially of pollution or radiation, occupying a very small area and having a concentrated output.

The American Heritage® Stedman's Medical Dictionary
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Example sentences
As you approach a point source of light, the number of photons reaching your eye from that given point increases as well.
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