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Dictionary


nod'al point'



Optics.
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. Also called node.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

nodalnodding acquaintance

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