vergency
n. நோக்காடியின் குவிவு விரிவு அளவை.
Ver"gen*cy, n. 1. The act of verging or approaching; tendency; approach. [R.] 2. (Opt.) Defn: 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.