Multiple choice

When a person enters a dark room from bright light he can not see anything clearly for some time.Slowly he starts seeing things this is because

  1. the iris contracts

  2. the iris expands

  3. the distance between the lens and retina increases

  4. the length of lens increases
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When moving from a bright environment to a dark room, the pupil needs to let in more light to help the eye adjust. The iris expands (or the pupil dilates) to increase the amount of light entering the eye.

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