nodal point

  1. either of two points on the axis of a lens or other optical system, determined by extending an incident oblique ray and the corresponding refracted ray to the axis for the pair of rays that are parallel outside the optical system.

Origin of nodal point

First recorded in 1835–45

Words Nearby nodal point Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

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