VERGENCY
\vˈɜːd͡ʒənsi], \vˈɜːdʒənsi], \v_ˈɜː_dʒ_ə_n_s_i]\
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The act of verging or approaching; tendency; approach.
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The reciprocal of the focal distance of a lens, used as measure of the divergence or convergence of a pencil of rays.
By Oddity Software
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The act of verging or approaching; tendency; approach.
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The reciprocal of the focal distance of a lens, used as measure of the divergence or convergence of a pencil of rays.
By Noah Webster.
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(optics). Reciprocal of focal distance of lens as measure of divergence or convergence of rays.
By Sir Augustus Henry