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point source
source of incoherent radiation, the dimensions of which are small enough, compared to the distance between the source and the irradiated surface, to be negligible in calculations and measurements
Note 1 to entry: A point source that emits uniformly in all directions is called "uniform point source" or "isotropic point source".
Note 2 to entry: This entry was numbered 845-01-19 in IEC 60050-845:1987.
Note 3 to entry: This entry was numbered 17-964 in CIE S 017:2011.