principal focus

principal focus
See focal point (def. 1).
[1825-35]

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  • Principal focus — 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

  • principal focus — noun : the focus for a beam of incident rays parallel to the axis * * * Optics. See focal point (def. 1). [1825 35] * * * principal focus (optics) The focus for rays parallel to the axis • • • Main Entry: ↑focus …   Useful english dictionary

  • principal focus — /prɪnsəpəl ˈfoʊkəs/ (say prinsuhpuhl fohkuhs) noun → focal point (def. 1) …  

  • 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

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  • focus — {{Roman}}I.{{/Roman}} noun 1 special interest/attention ADJECTIVE ▪ central, main, major, primary, prime, principal, real ▪ important, speci …   Collocations dictionary

  • Focus (optics) — An image that is partially in focus, but mostly out of focus in varying degrees. In geometrical optics, a focus, also called an image point, is the point where light rays originating from a point on the object converge.[1] Although the focus is… …   Wikipedia

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  • Principal photography of The Lord of the Rings film trilogy — Principal photography for The Lord of the Rings film trilogy was conducted concurrently in New Zealand from October 11, 1999 through to December 22, 2000 for 274 days. Pick up shoots were conducted annually from 2001 to 2004. The trilogy was shot …   Wikipedia

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