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)

Lexicographical Neighbors of Relative Aperture

relational database management system
relational threshold
relations
relationship
relationship
relationships
relation back
relation to
relative
relative
relative-in-law
relatively
relatives
relative accommodation
relative afferent pupillary defect
relative aperture (current term)
relative atomic mass
relative basal area
relative biological effectiveness
relative clause
relative dehydration
relative density
relative frequency
relative humidity
relative immunity
relative incidence
relative incompetence
relative leukocytosis
relative majority
relative molecular mass

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