Which part of the eye controls the amount of light entering it?   

Correct option is A

Answer: (a) Iris
· Explanation: The iris controls the diameter and size of the pupil.
· (b) Retina – Detects light and sends signals to the brain.
· (c) Cornea – Outer surface that refracts light.
· (d) Lens – Focuses light on the retina.