Definition of eyepiece

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Photonics Dictionary

eyepiece: Also known as ocular. The lens system used between the final real image in a visual optical system and eye. It acts as an image magnifier. Many types of eyepieces are known; e.g., the Huygens used in microscopes, the Ramsden in surveying instruments, the Kellner in prism binoculars, and the Erfle in military instruments and wide-angle binoculars.

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