Medical Definition of Relative aperture

1. The ratio of the focal length of a lens to the diameter of its entrance pupil. This gives a number known as the f-number, usually written f:8, f:16, etc. Thus, if the focal length is divided by the number 8, 16, etc., the result will be the diameter of the entrance pupil of the lens, or if the diaphragm of the lens is wide open it will be very nearly the diameter of the free aperture of the lens. See: F-number. (05 Aug 1998)

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Lexicographical Neighbors of Relative Aperture

relative URL
relative accommodation
relative address
relative addresses
relative adjective
relative adjectives
relative afferent pupillary defect
relative aperture (current term)
relative basal area
relative biological effectiveness
relative clause
relative clauses
relative complement
relative dating
relative dehydration
relative densities
relative density
relative frequency
relative future tense
relative humidity
relative immunity

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