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prism' diop'ter



Optics.
a unit of prismatic deviation, in which the number one represents a prism that deflects a beam of light a distance of one centimeter on a plane placed normal to the initial direction of the beam and one meter away from the prism.

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

prism binocularprismoid

 

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