the lens or combination of lenses in an optical instrument through which the eye views the image formed by the objective lens or lenses; ocular.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use eyepiece in a sentence
This microscope itself features a soft eyepiece, large focus knob, and fixed lens while the full kit comes with 6 plant slides, 6 blank slides, slide case, lab guide, pipette, tweezers, specimen dish, and more.
When astronomers stopped looking through the eyepiece and started focusing on photographic plates instead, the planets became even more obscure.The Planets with the Giant Diamonds Inside - Issue 102: Hidden Truths | Corey S. Powell | July 7, 2021 | Nautilus
However, at the long wavelengths of radio light, the dishes of radio telescopes are shiny too, reflecting radio waves from the sky up to a receiver, just as visible light reflects off a telescope’s mirror and into an eyepiece.
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
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
This is an ordinary eyepiece fitted with an adjustable square diaphragm operated by a lever projecting from the side of the mount.The Elements of Bacteriological Technique | John William Henry Eyre
British Dictionary definitions for eyepiece
the lens or combination of lenses in an optical instrument nearest the eye of the observer
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
Scientific definitions for eyepiece
The lens or group of lenses closest to the eye in an optical instrument such as a telescope or microscope.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.