Focus
['fəʊkəs] or ['fokəs]
Definition
(noun.) maximum clarity or distinctness of an image rendered by an optical system; 'in focus'; 'out of focus'.
(noun.) maximum clarity or distinctness of an idea; 'the controversy brought clearly into focus an important difference of opinion'.
(noun.) the concentration of attention or energy on something; 'the focus of activity shifted to molecular biology'; 'he had no direction in his life'.
(noun.) a fixed reference point on the concave side of a conic section.
(noun.) a point of convergence of light (or other radiation) or a point from which it diverges.
(noun.) a central point or locus of an infection in an organism; 'the focus of infection'.
(verb.) put (an image) into focus; 'Please focus the image; we cannot enjoy the movie'.
(verb.) become focussed or come into focus; 'The light focused'.
(verb.) cause to converge on or toward a central point; 'Focus the light on this image'.
Edited by Henry--From WordNet
Definition
(n.) A point in which the rays of light meet, after being reflected or refrcted, and at which the image is formed; as, the focus of a lens or mirror.
(n.) A point so related to a conic section and certain straight line called the directrix that the ratio of the distace between any point of the curve and the focus to the distance of the same point from the directrix is constant.
(n.) A central point; a point of concentration.
(v. t.) To bring to a focus; to focalize; as, to focus a camera.
Edited by Carlos
Synonyms and Synonymous
n. Central point, point of concentration, point of convergence.
Editor: Rodney
Synonyms and Antonyms
SYN:Centre, standpoint, rendezvous, convergence, nucleus
ANT:Circle, dispersion, dissipation, divergence, Foe,[See FRIEND]
Edited by Jessica
Definition
n. (opt.) a point in which several rays meet and are collected after being reflected or refracted while a virtual focus is a point from which rays tend after reflection or refraction—the principal focus is the focus of parallel rays after reflection or refraction: any central point:—pl. Fō′cuses Foci (fō′sī).—v.t. to bring to a focus: to concentrate:—pa.p. fō′cussed.—adj. Fō′cal of or belonging to a focus.—v.t. Fō′calise to bring to a focus: to concentrate.—n. Focimeter (fō-sim′e-tėr) an instrument for assisting in focussing an object in or before a photographic camera—usually a lens of small magnifying power.—Focussing cloth a cloth thrown over a photographic camera and the operator's head and shoulders to exclude all light save that coming through the lens.—Conjugate foci two points so situated that if a light be placed at one its rays will be reflected to the other; In focus placed or adjusted so as to secure distinct vision or a sharp definite image.
Typed by Leigh
Examples
- His Democratic opponents, especially Woodrow Wilson, are, as I write, in the midst of the Presidential campaign of 1912, trying to focus attention on the tariff. Walter Lippmann. A Preface to Politics.
- When we look at near objects, the muscles act in such a way that the lens bulges out, and becomes thick in the middle and of the right curvature to focus the near object upon the screen. Bertha M. Clark. General Science.
- The greater the refractive power of the lens, the greater the bending, and the nearer the principal focus to the lens. Bertha M. Clark. General Science.
- A whole village-full of sensuous emotion, scattered abroad all the year long, surged here in a focus for an hour. Thomas Hardy. The Return of the Native.
- Their fire had ceased entirely and all their energies seemed focused upon escape. Edgar Rice Burroughs. A Princess of Mars.
- His eyes were focused on the wine bowl but he was not seeing it. Hemingway, Ernest. For Whom The Bell Tolls.
- Rays of light are converged and focused at _F_. Bertha M. Clark. General Science.
- The heat rays from the element are focused on the dish in which the food is being prepared. Various. The Wonder Book of Knowledge.
- Focusing and ordering are thus the two aspects of direction, one spatial, the other temporal. John Dewey. Democracy and Education.
- A luminous image of any object placed in front of the lens is thrown in an inverted position upon the screen, which is of ground glass, to permit the image to be seen in focusing. Edward W. Byrn. The Progress of Invention in the Nineteenth Century.
- Nor is there anything disingenuous about this focusing of the attention: a real belief is there. Walter Lippmann. A Preface to Politics.
- Looked at externally it is a curious focusing of attention. Walter Lippmann. A Preface to Politics.
- K is the cathode plate, formed of a concave disk of aluminum, which focuses the rays at a point near the center of the bulb. Edward W. Byrn. The Progress of Invention in the Nineteenth Century.
- At the present time the conflict of philosophic theories focuses in discussion of the proper place and function of vocational factors in education. John Dewey. Democracy and Education.
- In practice, the operation would be somewhat as follows, generally speaking: The lens would first be focussed on the animate scene to be photographed. Frank Lewis Dyer. Edison, His Life and Inventions.
- The story of the part the new invention had played quickly spread abroad, and added to the intense public interest now focussed on it. Rupert S. Holland. Historic Inventions.
- Kitty Hawk, the place the Wrights had chosen because the Weather Bureau had told them the winds were strongest and steadiest there, now became one of the chief foci of the world’s attention. Rupert S. Holland. Historic Inventions.
Typed by Humphrey