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focus of parabola

См. также в других словарях:

  • Focus — Fo cus (f[=o] k[u^]s), n.; pl. E. {Focuses} (f[=o] k[u^]s*[e^]z), L. {Foci} (f[=o] s[imac]). [L. focus hearth, fireplace; perh. akin to E. bake. Cf. {Curfew}, {Fuel}, {Fusil} the firearm.] 1. (Opt.) A point in which the rays of light meet, after… …   The Collaborative International Dictionary of English

  • Focus tube — Focus Fo cus (f[=o] k[u^]s), n.; pl. E. {Focuses} (f[=o] k[u^]s*[e^]z), L. {Foci} (f[=o] s[imac]). [L. focus hearth, fireplace; perh. akin to E. bake. Cf. {Curfew}, {Fuel}, {Fusil} the firearm.] 1. (Opt.) A point in which the rays of light meet,… …   The Collaborative International Dictionary of English

  • Parabola — Pa*rab o*la, n.; pl. {Parabolas}. [NL., fr. Gr. ?; so called because its axis is parallel to the side of the cone. See {Parable}, and cf. {Parabole}.] (Geom.) (a) A kind of curve; one of the conic sections formed by the intersection of the… …   The Collaborative International Dictionary of English

  • focus — [fō′kəs] n. pl. focuses or foci [fō′sī΄] [ModL, adopted in math. senses by KEPLER Johannes (1604) < L, fireplace, hearth < ? IE base * bhok , to flame, burn > ? Arm boc̣, flame] 1. the point where rays of light, heat, etc. or waves of… …   English World dictionary

  • focus — ► NOUN (pl. focuses or foci) 1) the centre of interest or activity. 2) the state or quality of having or producing clear visual definition: his face is out of focus. 3) the point at which an object must be situated with respect to a lens or… …   English terms dictionary

  • parabola — [pə rab′ə lə] n. [ModL < Gr parabolē, lit., application, comparison (see PARABLE): it is produced by the “application” of a given area to a given straight line] Geom. a plane curve which is the path, or locus, of a moving point that remains… …   English World dictionary

  • Parabola — For other uses, see Parabola (disambiguation). A parabola …   Wikipedia

  • Focus (geometry) — Point F is a focus point for the red ellipse, green parabola and blue hyperbola. In geometry, the foci (  / …   Wikipedia

  • parabola — /peuh rab euh leuh/, n. Geom. a plane curve formed by the intersection of a right circular cone with a plane parallel to a generator of the cone; the set of points in a plane that are equidistant from a fixed line and a fixed point in the same… …   Universalium

  • Parabola/Proofs — This mathematics article is devoted entirely to providing mathematical proofs and support for claims and statements made in the article parabola. This article is currently an experimental vehicle to see how well we can provide proofs and details… …   Wikipedia

  • focus — focusable, adj. focuser, n. /foh keuhs/, n., pl. focuses, foci / suy, kuy/, v., focused, focusing or (esp. Brit.) focussed, focussing. n. 1. a central point, as of attraction, attention, or activity: The need to prevent a nuclear war became the… …   Universalium

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