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bn:00006620n
Noun Concept
Categories: Geometrical optics
EN
astigmatism  astigmia  Astigamatic  astigmatic  Astygmatism
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(optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point WordNet 3.0
English:
optics
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(optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point WordNet 3.0 & Open English WordNet
An optical system with astigmatism is one where rays that propagate in two perpendicular planes have different foci. Wikipedia
Refractive error in optics Wikidata
A defect of a lens such that light rays coming from a point do not meet at a focal point so that the image is blurred. Wiktionary
Defect of a lens. Wiktionary (translation)
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