Eyepiece (noun)

1. A part of a microscope, telescope, or other optical instrument, that is placed close to the eye and through which the observer views the object.
2. The lens or combination of lenses that is placed close to the eye in a telescope, microscope, or other optical instrument.

Origin:

Eyepiece is a compound word, the word eye + piece, meaning "a piece for the eye".

Examples:

1. He adjusted the eyepiece of the telescope to get a better view of the moon.
2. The eyepiece of a microscope magnifies the specimen that is being viewed.
3. The eyepiece of the binoculars was designed to reduce glare and improve image quality.
4. She had to change the eyepiece to get a better magnification on the microscope.
5. The eyepiece of the camera was made of high-quality glass.