Negative
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.

Look at other dictionaries:

  • Negative — Neg a*tive (n[e^]g [.a]*t[i^]v), a. [F. n[ e]gatif, L. negativus, fr. negare to deny. See {Negation}.] 1. Denying; implying, containing, or asserting denial, negation or refusal; returning the answer no to an inquiry or request; refusing assent;… …   The Collaborative International Dictionary of English

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  • negative — [neg′ə tiv] adj. [ME negatife < OFr or L: OFr négatif < L negativus < negatus: see NEGATION] 1. containing, expressing, or implying a denial or refusal; that says “no” [a negative reply] 2. opposite to something regarded as positive;… …   English World dictionary

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  • Negative — Neg a*tive (n[e^]g [.a]*t[i^]v), n. [Cf. F. n[ e]gative.] 1. A proposition by which something is denied or forbidden; a conception or term formed by prefixing the negative particle to one which is positive; an opposite or contradictory term or… …   The Collaborative International Dictionary of English

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  • Negative — Negative …   Википедия

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  • negative — abbreviation negative. noun (neg) informal a photographic negative. negative adjective 1》 consisting in or characterized by the absence rather than the presence of something.     ↘expressing or implying denial, disagreement, or refusal.… …   English new terms dictionary

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