Huygens eyepiece

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noun Optics.

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. 2023

How to use Huygens eyepiece in a sentence

Before beginning an exposure the focus is adjusted by means of a high-power positive eyepiece.
Photographs of Nebul and Clusters|James Edward Keeler
Looking through the eyepiece, the young inventor stood as though transfixed.
Tom Swift and His Giant Telescope|Victor Appleton
Beware of the popular error that an object held close in front of a telescope can be seen by an observer at the eyepiece.
A Text-Book of Astronomy|George C. Comstock
The attention of the world thus once awakened, Huygens and Cassini applied themselves to ascertain the figure of the earth.
Blackwood's Edinburgh Magazine, No. CCCXLII. Vol. LV. April, 1844|Various

Insert the eyepiece micrometer inside the ocular and adjust the stage micrometer on the stage of the microscope.
The Elements of Bacteriological Technique|John William Henry Eyre

British Dictionary definitions for Huygens eyepiece

Huygens' eyepiece

/ (ˈhaɪɡənz) /

noun

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