eyepiece

[ ahy-pees ]

noun

1. 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.

eyepiece

/ ˈaɪˌpiːs /

noun

1. the lens or combination of lenses in an optical instrument nearest the eye of the observer

eyepiece

/ ī′pēs′ /

1. The lens or group of lenses closest to the eye in an optical instrument such as a telescope or microscope.

Word History and Origins

Origin of eyepiece¹

First recorded in 1780–90; eye + piece

Example Sentences

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.

From Popular-Science

When astronomers stopped looking through the eyepiece and started focusing on photographic plates instead, the planets became even more obscure.

From 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.

From Quanta Magazine

Before beginning an exposure the focus is adjusted by means of a high-power positive eyepiece.

From Project Gutenberg

Looking through the eyepiece, the young inventor stood as though transfixed.

From Project Gutenberg

Beware of the popular error that an object held close in front of a telescope can be seen by an observer at the eyepiece.

From Project Gutenberg

Insert the eyepiece micrometer inside the ocular and adjust the stage micrometer on the stage of the microscope.

From Project Gutenberg

This is an ordinary eyepiece fitted with an adjustable square diaphragm operated by a lever projecting from the side of the mount.

From Project Gutenberg