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.

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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.

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bridge due to its focal power and consequent (perhaps exclusive) ability

The strategy of boilerplate

Every lens has a focal power. So if the bifocal is set for 16 inches, you can't see at 24 inches and vice versa.

PALs for pilots: cockpit friendly lenses: if presbyopia has set in, progressives are the lenses of choice for pilots. Younger, signet and varilux are among the top choices for pilots

The experimental lenses use different focal powers within a single lens: either alternating focal powers across the lens, or confined to the outer edge.