Aplanatic

Definition of Aplanatic

Ap`la`nat´ic
a.1.(Opt.) Having two or more parts of different curvatures, so combined as to remove spherical aberration; - said of a lens.
Aplanatic focus
(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.

Related Words

corrected, optics
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