vergency

Vergency

Ver"gen*cy\, n. 1. The act of verging or approaching; tendency; approach. [R.]

2. (Opt.) The reciprocal of the focal distance of a lens, used as measure of the divergence or convergence of a pencil of rays. [R.] --Humphrey Lloyd.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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