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What is "vergency"

The Collaborative International Dictionary
Vergency

Vergency \Ver"gen*cy\, n.

  1. The act of verging or approaching; tendency; approach.

  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.

Wiktionary
vergency

n. 1 The act of verge or approaching; tendency. 2 The reciprocal of the focal distance of a lens, used as a measure of the divergence or convergence of a pencil of rays.