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Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This
eye·piece    Audio Help   [ahy-pees] Pronunciation Key
–noun
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.


[Origin: 1780–90; eye + piece]
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.
Eye Piece
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Eyepiece

To learn more about Eyepiece visit Britannica.com

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American Heritage Dictionary - Cite This Source - Share This
eye·piece    Audio Help   (ī'pēs')  Pronunciation Key 
n.   The lens or lens group closest to the eye in an optical instrument; an ocular. Also called eyeglass.

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
WordNet - Cite This Source - Share This
eyepiece

noun
combination of lenses at the viewing end of optical instruments 

WordNet® 3.0, © 2006 by Princeton University.
The American Heritage Science Dictionary - Cite This Source - Share This
eyepiece    Audio Help   (ī'pēs')  Pronunciation Key 
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 © 2002 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Webster's Revised Unabridged Dictionary - Cite This Source - Share This

eyepiece

Eye"piece`\, n. (Opt.) The lens, or combination of lenses, at the eye end of a telescope or other optical instrument, through which the image formed by the mirror or object glass is viewed.

Collimating eyepiece. See under Collimate.

Negative, or Huyghenian, eyepiece, an eyepiece consisting of two plano-convex lenses with their curved surfaces turned toward the object glass, and separated from each other by about half the sum of their focal distances, the image viewed by the eye being formed between the two lenses. it was devised by Huyghens, who applied it to the telescope. Campani applied it to the microscope, whence it is sometimes called Campani's eyepiece.

Positive eyepiece, an eyepiece consisting of two plano-convex lenses placed with their curved surfaces toward each other, and separated by a distance somewhat less than the focal distance of the one nearest eye, the image of the object viewed being beyond both lenses; -- called also, from the name of the inventor, Ramsden's eyepiece.

terrestrial, or Erecting eyepiece, an eyepiece used in telescopes for viewing terrestrial objects, consisting of three, or usually four, lenses, so arranged as to present the image of the object viewed in an erect position.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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