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. |
| (Opt.) | See under Aplanatic. |
See also: Aplanatic, Focus
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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