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aplanatic 等光程; 不暈的 等光程; 不暈的 aplanatic adj 1: free from or corrected for spherical aberration; "an aplanatic mirror" Aplanatic \Ap`la*nat"ic\, a. [Gr. 'a priv. ? disposed to
wander, wandering, ? to wander.] (Opt.) Having two or more parts of different curvatures, so combined as to remove spherical aberration; -- said of a lens. [1913 Webster] {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. [1913 Webster]
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