[Answer] Iris aperture crossword clue

• Iris apertureIn humans and most mammals and birds, the (plural: irides or irises) is a thin, circular structure in the eye, responsible for controlling the diameter and size of the pupil and thus the amount of light reaching the retina. Eye color is defined by that of the . In optical terms, the pupil is the eye's aperture, while the is the diaphragmA device called a diaphragm usually serves as the aperture stop, and controls the aperture. The diaphragm functions much like the of the eye – it controls the effective diameter of the lens opening. Reducing the aperture size increases the depth of field, which describes the extent to which subject matter lying closer than or farther from the actual plane of focus appears to be in focus.The is the diaphragm, and the opening in the of the eye (the pupil) is the aperture. An analogous dev in a photographic lens is called an diaphragm. An diaphragm can reduce the amount light that hits a detector by decreasing the aperture, usually with "leaves" that form a circle. is a genus of 260–300 species of flowering plants with showy flowers. It takes its name from the Greek word for a rainbow, which is also the name for the Greek goddess of the rainbow, . Some authors state that the name refers to the wide variety of flower colors found among the many species.

Answer: PUPIL

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