Multiple choice

Why does the pupil of the eye appear black in colour?

  1. Light rays entering the pupil are absorbed by the tissues.

  2. Pupil regulates the amount of light.

  3. It contains smooth muscles.

  4. Due to the presence of blood vessels

  5. Due to the absence of blood vessels
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A Correct answer
Explanation

The pupil is a hole located in the center of the iris of the eye that allows light to enter the retina. It appears black because light rays entering the pupil are either absorbed by the tissues inside the eye directly or absorbed after diffuse reflections within the eye that mostly miss exiting the narrow pupil.

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