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aberration, optical

A Dictionary of Astronomy
Ian RidpathIan Ridpath

aberration, optical 

An imperfection or error in the image produced by a lens, mirror, or optical system. There are six types of aberration: chromatic aberration, spherical aberration, coma (see Coma, Optical), field curvature, distortion, and astigmatism. Chromatic aberration is not present in images formed by mirrors. All can be corrected to a greater or lesser extent by suitable optical design.