- entrance pupil
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the image of the aperture viewed from the objective of an optical system limiting the rays that enter the system. Cf. exit pupil.
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Universalium. 2010.
entrance pupil
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Entrance pupil — For the part of the eye, see Pupil. A camera lens adjusted for large and small aperture. The entrance pupil is the image of the physical aperture, as seen through the front of the lens. The size and location may differ from those of the physical… … Wikipedia
entrance pupil — noun : the stop in an optical instrument or the virtual image of the stop that determines the angular diameter of the bundle of rays traversing the instrument from a given point in the object space compare exit pupil * * * Optics. the image of… … Useful english dictionary
pupil — pupil1 pupilless, adj. /pyooh peuhl/, n. 1. a person, usually young, who is learning under the close supervision of a teacher at school, a private tutor, or the like; student. 2. Civil Law. an orphaned or emancipated minor under the care of a… … Universalium
Pupil — The pupil is the hole that is located in the center of the iris of the eye and that controls the amount of light that enters the eye.Cassin, B. and Solomon, S. Dictionary of Eye Terminology . Gainsville, Florida: Triad Publishing Company, 1990.]… … Wikipedia
Pupil (disambiguation) — The pupil is the variable sized, black circular opening in the centre of the iris.Pupil may also refer to:*Pupil, another term for a student *Pupil (band), a Filipino rock band *Pupil, a trainee Barrister (England and Wales) *The terms Entrance… … Wikipedia
Pupil magnification — The pupil magnification of an optical system is the ratio of the diameter of the exit pupil to the diameter of the entrance pupil. The pupil magnification is used in calculations of exposure. For all symmetric lenses, and for many conventional… … Wikipedia
Exit pupil — In optics, the exit pupil is a virtual aperture in an optical system. Only rays which pass through this virtual aperture can exit the system. The exit pupil is the image of the aperture stop in the optics that follow it. In a telescope or… … Wikipedia
exit pupil — noun : the image of the entrance pupil of an optical system viewed from the image space (as at the eyepiece) * * * Optics. the ridge of the entrance pupil of an optical system, indicating the place where the pupil of the eye should be placed to… … Useful english dictionary
exit pupil — Optics. the ridge of the entrance pupil of an optical system, indicating the place where the pupil of the eye should be placed to view the object. Also called eye point. * * * … Universalium
Common Entrance Examination — Common Entrance Examinations (commonly known as CE) are taken by some children in the UK as part of the admissions process for academically selective secondary schools at age 13 or (for girls) 11. Most of the secondary schools that use Common… … Wikipedia
