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Focal distance   /fˈoʊkəl dˈɪstəns/   Listen
adjective
Focal  adj.  Belonging to,or concerning, a focus; as, a focal point.
Focal distance or
Focal 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.






Collaborative International Dictionary of English 0.48








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"Focal distance" Quotes from Famous Books



... follows that a small picture, being viewed at its proper focal distance, reflects the same sized image as a larger one at its proper focal distance, I can see no good reason why the physical attribute of largeness should be so eagerly sought for by the public. Surely a gallery of small pictures, provided they be not painfully small, should be preferred ...
— The Knickerbocker, or New-York Monthly Magazine, February 1844 - Volume 23, Number 2 • Various

... man seems to himself to be material sub- 301:24 stance, while man is "image" (idea). Delusion, sin, dis- ease, and death arise from the false testimony of material sense, which, from a supposed standpoint outside the 301:27 focal distance of infinite Spirit, presents an inverted image of Mind and substance with ...
— Science and Health With Key to the Scriptures • Mary Baker Eddy



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