The amount of light entering the eye is controlled by the size of the
Question
The amount of light entering the eye is controlled by the size of the
Solution
The amount of light entering the eye is controlled by the size of the pupil. The pupil is the circular opening in the center of the eye's iris. When the surrounding environment is bright, the iris contracts, reducing the size of the pupil to limit the amount of light that enters the eye. Conversely, in a dim environment, the iris relaxes, allowing the pupil to expand and let in more light. This process is known as pupillary reflex.
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