how amount of light entering in the Eye Centre
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Explanation:
The iris is the ring of pigmented tissue surrounding the pupil that varies in color. The iris opens and closes to control the amount of light entering the eye through the pupil. The pupil is the opening in the center of the iris where light enters the eye.
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The human eye contains about 125 million rods, which are necessary for seeing in dim light. Cones, on the other hand, function best in bright light.
Sorry dear I can't understand ur question
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