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Huygens eyepiece

noun, Optics.
1.
an eyepiece consisting of two plano-convex lenses, the plane sides of which both face the eye.
Origin of Huygens eyepiece
1830-1840
1830-40; named after C. Huygens
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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