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Definition of Focal distance
1. Noun. The distance from a lens to its focus.
Medical Definition of Focal distance
1. The distance from the centre of a lens to its focus. (05 Mar 2000)
Lexicographical Neighbors of Focal Distance
Literary usage of Focal distance
Below you will find example usage of this term as found in modern and/or classical literature:
1. Elementary Treatise on Physics, Experimental and Applied by Adolphe Ganot (1893)
"What is the focal distance of the mirror? Aits. 3*3077 feet. ... Required the
focal distance of a crown-glass meniscus, the radius of curvature of the ..."
2. Text-book of Ophthalmology by Ernst Fuchs (1911)
"a fraction whose denominator is the principal focal distance, in accordance with
the law that the refractive power is the reciprocal of the focal distance. ..."
3. The Encyclopædia Britannica: A Dictionary of Arts, Sciences, Literature and by Hugh Chisholm (1911)
")be the focal distance У of the ¡mage F'O', and f the image- Oi side focal length
F'H'; then y'/y = ж'/f. The ratio of FlG. ..."
4. Treatise on Optics by David Brewster, Alexander Dallas Bache (1854)
"If the glass is equally convex, r = /, and The principal focal distance is equal
to the ... The principal focal distance may serve as a convenient term of ..."
5. A Text-book of physiology: For Medical Students and Physicians by William Henry Howell (1915)
"The refractive power of lenses is expressed usually in terms of their principal
focal distance. A lens with a distance of one meter is taken as the unit and ..."
6. Textbook of human physiology by Leonard Landois, William Stirling (1889)
"the far point = со , and the near point = 5 inches, has a power of accommodation
equal to a Icn« nf 5 inches focal distance. When the lens by the energy of ..."
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