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" The focal length of a lens is the distance of the principal focus from the lens. "
Manual of optics, by J.A. Galbraith and S. Haughton - Page 32
by Joseph Allen Galbraith - 1854
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Natural Philosophy

Isaac Sharpless, George Morris Philips - Physics - 1892 - 350 pages
...Convex Lens. — A convex lens brings parallel rays of light to a point called the principal focus. The focal length of a lens is the distance of the principal focus from the centre of the lens. (AF, Fig. 168.) The sharper the curvature of a lens (the smaller the lens) the...
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