Focal

Definition of Focal

Fo´cal

a.

1.

Belonging to,or concerning, a focus; as, a focal point.

Focal distance, or length, of a lens or mirror
(Opt.) the distance of the focus from the surface of the lens or mirror, or more exactly, in the case of a lens, from its optical center.

Focal distance of a telescope
the distance of the image of an object from the object glass.

Related Words

approaching, arch, asymptotic, banner, basic, bedrock, capital, cardinal, central, centralized, centred, centripetal, centrolineal, champion, chief, concentrated, concurrent, confluent, confocal, connivent, convergent, converging, crowning, dominant, essential, first, foremost, fundamental, great, headmost, hegemonic, indispensable, leading, life-and-death, life-or-death, magisterial, main, master, material, meeting, mutually approaching, of vital importance, overruling, paramount, predominant, preeminent, preponderant, prevailing, primal, primary, prime, principal, radial, radiating, ranking, ruling, sovereign, star, stellar, substantive, supereminent, tangent, tangential, topflight, uniting, vital

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Focal distance of a telescope
Focal distance, or length, of a lens or mirror
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