Focal

Fo"cal

(?), a. [Cf. F. focal. See Focus.] Belonging to,or concerning, a focus; as, a focal point.
[1913 Webster]

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.
[1913 Webster]

 

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Thu 13th December 2018