Dictionary

focal length

noun

: the distance from the surface of a lens to the point of focus (sense 3)

Full Definition of FOCAL LENGTH

:  the distance of a focus from the surface of a lens or curved mirror

First Known Use of FOCAL LENGTH

1693

Rhymes with FOCAL LENGTH

Medical Dictionary

focal length

noun \-ˌleŋ(k)th\

Medical Definition of FOCAL LENGTH

:  the distance of a focus from the surface of a lens or concave mirror—symbol f

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