eng
point source
source of electromagnetic radiation that is resolved in the ideal case to a single point or direction in space
Note 1 to entry: A natural star is an ideal point source. In the laboratory on the ground, a point source is simulated using an optical collimator.
Note 2 to entry: This entry is adapted from Reference [12].
[SOURCE: ISO/TS 19124-1:2023, 3.20]