In geometric optics, stigmatism refers to the image-formation property of an optical system which focuses a single point source in one phase optics space into a single point in image space. Two such points are called a stigmatic pair of the optical system.
In geometric optics, stigmatism refers to the image-formation property of an optical system which focuses a single point source in one phase optics space into a single point in image space. Two such points are called a stigmatic pair of the optical system.
Source: Wikipedia "Stigmatism" · CC BY-SA 4.0
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