VERGENCY

Noun

vergency (plural vergencies)

The act of verging or approaching; tendency.

The reciprocal of the focal distance of a lens, used as a measure of the divergence or convergence of a pencil of rays.

Source: Wiktionary

Ver"gen*cy, n.

1. The act of verging or approaching; tendency; approach. [R.]

2. (Opt.)

Definition: 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.

Source: Webster’s Unabridged Dictionary 1913 Edition

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