Point-source
noun, Physics, Optics.
1.
a source of radiation sufficiently distant compared to its length and width that it can be considered as a point.
noun
1.
(optics) a source of light or other radiation that can be considered to have negligible dimensions
point source n.
A source, especially of pollution or radiation, occupying a very small area and having a concentrated output.
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Attach blame to, accuse, as in When they asked her who broke the window, she pointed the finger at Tom . Also see put the finger on