eye-piece

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

Syn: ocular. [1913 Webster]

{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. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Игры ⚽ Поможем сделать НИР

Look at other dictionaries:

  • eye|piece — «Y PEES», noun. the lens, or set of lenses in a telescope or microscope that is nearest the eye of the user …   Useful english dictionary

  • eye·piece — …   Useful english dictionary

  • Eye relief — The eye relief of a telescope, a microscope, or binoculars is the distance from the last surface of an eyepiece at which the eye can be placed to match the eyepiece exit pupil to the eye s entrance pupil. Short eye relief requires the observer to …   Wikipedia

  • Eye surgery — Intervention Eye surgery in the Middle Ages. ICD 10 PCS 08 ICD 9 CM …   Wikipedia

  • Eye neoplasm — Classification and external resources ICD 10 C69 ICD 9 190 …   Wikipedia

  • Eye music — (often referred to in English by its exact German translation Augenmusik ) describes graphical features of scores that when performed are unnoticeable by the listener.Difficulties in defining eye musicA clear definition of eye music is elusive,… …   Wikipedia

  • Eye in the Sky (album) — Eye in the Sky Studio album by The Alan Parsons Project Released June 1982 …   Wikipedia

  • eye patch — UK US noun [countable] [singular eye patch plural eye patches] a piece of cloth, plastic etc used for covering one eye Thesaurus: bandages, supports and other dressings …   Useful english dictionary

  • eye patch — n a piece of material worn over one eye, usually because that eye has been damaged …   Dictionary of contemporary English

  • eye patch — eye patches N COUNT An eye patch is a piece of material which you wear over your eye when you have damaged or injured it …   English dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”