Achromatic prism
Prism Prism (pr[i^]z'm), n. [L. prisma, Gr. pri`sma, fr. pri`zein, pri`ein, to saw: cf. F. prisme.] 1. (Geom.) A solid whose bases or ends are any similar, equal, and parallel plane figures, and whose sides are parallelograms. [1913 Webster]

Note: Prisms of different forms are often named from the figure of their bases; as, a triangular prism, a quadrangular prism, a rhombic prism, etc. [1913 Webster]

2. (Opt.) A transparent body, with usually three rectangular plane faces or sides, and two equal and parallel triangular ends or bases; -- used in experiments on refraction, dispersion, etc. [1913 Webster]

3. (Crystallog.) A form the planes of which are parallel to the vertical axis. See {Form}, n., 13. [1913 Webster]

{Achromatic prism} (Opt.), a prism composed usually of two prisms of different transparent substances which have unequal dispersive powers, as two different kinds of glass, especially flint glass and crown glass, the difference of dispersive power being compensated by giving them different refracting angles, so that, when placed together so as to have opposite relative positions, a ray of light passed through them is refracted or bent into a new position, but is free from color.

{Nicol's prism}, {Nicol prism}. [So called from Wm. Nicol, of Edinburgh, who first proposed it.] (Opt.) An instrument for experiments in polarization, consisting of a rhomb of Iceland spar, which has been bisected obliquely at a certain angle, and the two parts again joined with transparent cement, so that the ordinary image produced by double refraction is thrown out of the field by total reflection from the internal cemented surface, and the extraordinary, or polarized, image alone is transmitted. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Achromatic prism — Achromatic Ach ro*mat ic, a. [Gr. ? colorless; a priv. + ?, ?, color: cf. F. achromatique.] 1. (Opt.) Free from color; transmitting light without decomposing it into its primary colors. [1913 Webster] 2. (Biol.) Uncolored; not absorbing color… …   The Collaborative International Dictionary of English

  • achromatic prism — achromatinė prizmė statusas T sritis fizika atitikmenys: angl. achromatic prism vok. achromatisches Prisma, n rus. ахроматическая призма, f pranc. prisme achromatique, m …   Fizikos terminų žodynas

  • achromatic prism — noun : a prism made by combining two or more prisms of different refractive index so designed and placed that a ray of white or other nonhomogeneous light passing through the prism is deviated but not dispersed into a spectrum compare amici prism …   Useful english dictionary

  • achromatic prism — Optics. a system of two or more prisms of different substances that deflects but does not disperse a beam of light. * * * …   Universalium

  • Achromatic — Ach ro*mat ic, a. [Gr. ? colorless; a priv. + ?, ?, color: cf. F. achromatique.] 1. (Opt.) Free from color; transmitting light without decomposing it into its primary colors. [1913 Webster] 2. (Biol.) Uncolored; not absorbing color from a fluid;… …   The Collaborative International Dictionary of English

  • Achromatic lens — Achromatic Ach ro*mat ic, a. [Gr. ? colorless; a priv. + ?, ?, color: cf. F. achromatique.] 1. (Opt.) Free from color; transmitting light without decomposing it into its primary colors. [1913 Webster] 2. (Biol.) Uncolored; not absorbing color… …   The Collaborative International Dictionary of English

  • Achromatic telescope — Achromatic Ach ro*mat ic, a. [Gr. ? colorless; a priv. + ?, ?, color: cf. F. achromatique.] 1. (Opt.) Free from color; transmitting light without decomposing it into its primary colors. [1913 Webster] 2. (Biol.) Uncolored; not absorbing color… …   The Collaborative International Dictionary of English

  • Prism — (pr[i^]z m), n. [L. prisma, Gr. pri sma, fr. pri zein, pri ein, to saw: cf. F. prisme.] 1. (Geom.) A solid whose bases or ends are any similar, equal, and parallel plane figures, and whose sides are parallelograms. [1913 Webster] Note: Prisms of… …   The Collaborative International Dictionary of English

  • Prism (optics) — For other uses, see Prism (disambiguation). A plastic prism In optics, a prism is a transparent optical element with flat, polished surfaces that refract light. The exact angles between the surfaces depend on the application. The traditional… …   Wikipedia

  • achromatic — adjective /eɪˈkɹəʊ.mæt.ɪk/ a) Free from color; transmitting light without color related distortion. The lecture was achromatic, the speaker used politics to suppress the weight of his/her subject. b) Containing components such as achromatic… …   Wiktionary

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