vergency

English

Noun

vergency (plural vergencies)

  1. The act of verging 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.
    • 1863, The Civil Engineer and Architect's Journal
      When, by the pencil becoming oblique to the surface, the vergency produced on the pencil becomes changed, the primary and secondary focal points, V and H, separate […]
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