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