Question

function of pupil in human eye.

Answer 1

Pupil imparts the colour to the eye and adjusts the amount of light entering in our eye.

Answer 2

Most basic function is to protect the eye from the sunlight and UV rays.

It changes size according to the intensity of light incoming to get a good vision.

It contains the color pigment and this pigment is ordered in a way different from a human to another. That's what you'd call an eye scan, pretty similar to how fingerprints work.

Changes the angle of vision according to the orders coming from the brain delivered by the neurological system.