eyepiece
nounUK /ˈaɪpiːs/
US /ˈaɪpiːs/
The part of a tool you look through with your eye.
She looked through the eyepiece of the telescope to see the moon.
RELATED WORDS
OTHER MEANINGS
2. The lens or group of lenses closest to the eye in an optical instrument.
The eyepiece magnifies the image formed by the main lens.
3. A small lens on a camera or other device used for viewing.
He adjusted the eyepiece to get a sharper focus.
4. The viewing end of a periscope or similar instrument.
The submarine captain peered into the eyepiece.