Multiple choice

When a person walking in bright Sunlight enters a dark room, he is not able to see clearly for a little while because ______.

  1. the eye muscles cannot immediately adjust the focal length of the eye lens

  2. the retina retains the bright images for sometime and becomes momentarily insensitive

  3. the iris is unable to contract the pupil immediately

  4. the iris is unable to dilate the pupil immediately
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When entering a dark room from bright light, the iris needs to dilate the pupil to allow more light in. This process takes time, causing temporary vision difficulty. The iris muscles cannot instantly switch from constricted to dilated state.

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