GK QUESTION#2915
Consider the following statements about the human eye’s response when moving from a brightly lit room to a dimly lit one: Statement I: The iris controls the size of the pupil, adjusting the amount of light entering the eye. Statement II: In a brightly lit environment, the iris keeps the pupil small; when entering a dim room, the pupil gradually dilates to allow more light in, which takes time. Which of the statements is/are correct?
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Answer
C. Both Statement I and II are correct
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Explanation
Both statements are correct. The iris adjusts the pupil opening: it becomes smaller in bright light and larger in dim light. Pupil adjustment contributes to adaptation; retinal adaptation also affects how well we see in darkness.