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
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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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