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diaphragm


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An opaque disk with a circular aperture at its centre. Diaphragms of different sizes are used to control the total light flux passing through an optical system or to reduce aberration by restricting the light passing through a system to the central portion. An iris diaphragm consists of a number of overlapping crescent-shaped disks arranged so that the central aperture can be continuously varied in diameter.

Subjects: Physics.


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