Focal: alternatives and connections

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 su…

To draw or direct to a common center; to bring together at a focus or point, as two or more lines; to concentrate.

A solid of the form described by the revolution of a right-angled triangle about one of the sides adjacent to the right angle; -- call…

tending to one point of focus; tending to approach each other; converging.

To converge to one point or focus, as light or rays.

biconvex transparent body situated behind the iris in the eye; its role (along with the cornea) is to focus light on the retina

A straight line so situated with respect to a conic section that the distance of any point of the curve from it has a constant ratio t…

The point in the heavens where the sun is seen to rise at the equinox, or the corresponding point on the earth; that one of the four c…

the distance from a lens to its focus

the distance from a lens to its focus

To bring to a focus; to focus; to concentrate.

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…

The figure or picture of any object formed at the focus of a lens or mirror, by rays of light from the several points of the object sy…

a law stating that the orbit of each planet is an ellipse with the sun at one focus of the ellipse

The line drawn through a focus of a conic section parallel to the directrix and terminated both ways by the curve. It is the parameter…

biconvex transparent body situated behind the iris in the eye; its role (along with the cornea) is to focus light on the retina

A horizontal line or plane; that is, a straight line or a plane which is tangent to a true level at a given point and hence parallel t…

A rigid piece which is capable of turning about one point, or axis (the fulcrum), and in which are two or more other points where forc…