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Aplanatic   Listen
adjective
Aplanatic  adj.  (Opt.) Having two or more parts of different curvatures, so combined as to remove spherical aberration; said of a lens.
Aplanatic focus of a lens (Opt.), the point or focus from which rays diverging pass the lens without spherical aberration. In certain forms of lenses there are two such foci; and it is by taking advantage of this fact that the best aplanatic object glasses of microscopes are constructed.






Collaborative International Dictionary of English 0.48








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