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What is the meaning of FOCI. Phrases containing FOCI
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FOCI
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Acronyms & AI meanings
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FOCI
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pl.
of Focus
n.
An assisting instrument for focusing an object in or before a camera.
a.
Having the same foci; as, confocal quadrics.
v. t.
To nourish.
n.
Comfort; support.
n.
One of foci of an ellipse, or other curve.
n.
The convergence to different foci, by a lens or mirror, of rays of light emanating from one and the same point, or the deviation of such rays from a single focus; called spherical aberration, when due to the spherical form of the lens or mirror, such form giving different foci for central and marginal rays; and chromatic aberration, when due to different refrangibilities of the colored rays of the spectrum, those of each color having a distinct focus.
n.
A curve formed by a section of a cone, when the cutting plane makes a greater angle with the base than the side of the cone makes. It is a plane curve such that the difference of the distances from any point of it to two fixed points, called foci, is equal to a given distance. See Focus. If the cutting plane be produced so as to cut the opposite cone, another curve will be formed, which is also an hyperbola. Both curves are regarded as branches of the same hyperbola. See Illust. of Conic section, and Focus.
FOCI
FOCI