paraxial(redirected from Paraxial approximation)
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Related to Paraxial approximation: paraxial rays
paraxial(pă-raks -ee-ăl) Lying close to the optical axis of a lens, mirror, or system of such elements.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
(science and technology)
Lying near the axis.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.