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What is iris diaphragm
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What is iris diaphragm

User Reza Farjam
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a flat, colored, ring-shaped membrane behind the cornea of the eye, with an adjustable circular opening (pupil) in the center.
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User Kopecs
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Answer:

noun Optics, Photography. a composite diaphragm with a central aperture readily adjustable for size, used to regulate the amount of light admitted to a lens or optical system. Also called iris.

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User TheRiley
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