focal : Idioms & Phrases

Index

focal distance

  • noun the distance from a lens to its focus
    focal distance.
WordNet

Focal distance of a telescope

  • the distance of the image of an object from the object glass.
Webster 1913

Focal distance, or length,of a lens or mirror

  • (Opt.), the distance of the focus from the surface of the lens or mirror, or more exactly, in the case of a lens, from its optical center.
Webster 1913

focal epilepsy

  • noun epilepsy in which the attacks begins with an isolated disturbance of cerebral function (as a twitching of a limb or an illusory sensation or a mental disturbance)
    cortical epilepsy.
WordNet

focal infection

  • noun bacterial infection limited to a specific organ or region especially one causing symptoms elsewhere
WordNet

focal length

  • noun the distance from a lens to its focus
    focal distance.
WordNet

focal point

  • noun a point of convergence of light (or other radiation) or a point from which it diverges
    focus.
  • noun a central point or locus of an infection in an organism
    nidus; focus.
    • the focus of infection
  • noun the concentration of attention or energy on something
    direction; centering; focussing; focus; focusing.
    • the focus of activity shifted to molecular biology
    • he had no direction in his life
WordNet

focal ratio

  • noun the ratio of the focal length to the diameter of a (camera) lens system
    f number; stop number; speed.
WordNet

focal seizure

  • noun transitory disturbance in motor or sensory function resulting from abnormal cortical activity
WordNet