Associations to the word «Focal»

Wiktionary

FOCAL, adjective. Belonging to, concerning, or located at a focus
FOCAL, adjective. (medicine) limited to a small area
FOCAL DEPTH, noun. (geology) The depth below the Earth's surface of the hypocentre of an earthquake.
FOCAL DEPTH, noun. (optics) The field of view of a camera that is in sharp focus.
FOCAL DEPTHS, noun. Plural of focal depth
FOCAL LENGTH, noun. (optics) The distance at which something (e.g. a lens, mirror etc.) is in focus; in air it is the distance along the optical axis from a "principal plane" of the lens to one of the lens's focal points.
FOCAL LENGTHS, noun. Plural of focal length
FOCAL PLANE, noun. (optics) Any plane perpendicular to the axis of a lens or mirror
FOCAL PLANE, noun. (optics) Such a plane, in a camera, microscope etc, in which the real image is in focus
FOCAL POINT, noun. (optics) A focus; a point at which rays of light or other radiation converge.
FOCAL POINT, noun. The centre of any activity.
FOCAL POINT, noun. (arts) (aesthetics) A feature that attracts particular attention.
FOCAL POINT, noun. (game theory) A solution that people will tend to use in the absence of communication, because it seems natural, special, or relevant.
FOCAL POINTS, noun. Plural of focal point

Dictionary definition

FOCAL, adjective. Having or localized centrally at a focus; "focal point"; "focal infection".
FOCAL, adjective. Of or relating to a focus; "focal length".

Wise words

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Lao-Tzu