focal power


Also found in: Medical.

focal power

[′fō·kəl ‚pau̇·ər]
(optics)
A measure of the ability of a lens, mirror, prism, or optical system to converge a parallel beam of light; equals the reciprocal of the focal length. Also known as power.
References in periodicals archive ?
Each chapter approaches the very broad theme of "innovation dynamics" with lenses of varying focal power. Some focus on a single country, while others are comparative; some look mostly at the strategic choices of domestic actors, whereas others are concerned with the impact of foreign drivers.
bridge due to its focal power and consequent (perhaps exclusive) ability
He smiled and told me it had now been scientifically proven that a carefully crafted photographic image can truly outperform our own fairly advanced focal powers. Many years on, This Land echoes that brief conversation and portrays 50 places that represent the great variety of the British countryside.
The experimental lenses use different focal powers within a single lens: either alternating focal powers across the lens, or confined to the outer edge.