an eyepiece consisting of two plano-convex lenses, the plane sides of which both face the eye.
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Origin of Huygens eyepiece
First recorded in 1830–40; named after C. Huygens
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
British Dictionary definitions for Huygens eyepiece
/ (ˈhaɪɡənz) /
physics a telescope eyepiece consisting of two planoconvex lenses separated by a distance equal to half the sum of their focal lengths, which are in the ratio of three to one, and oriented so that their curved surfaces face the incident light
Word Origin for Huygens' eyepiece
C19: named after Christiaan Huygens (1629–95), Dutch physicist
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012