Question

what is mean by Pupil and its function

Answer 1

The small hole In the iris.

Answer 2

The pupil is the opening in the centre of the iris. The size of the pupil determines the amount of light that enters the eye.

Depending on the brightness of the light that falls on the eye, the pupil will get larger (expand) or smaller (contract).

1) Light passes through the cornea covering the eye which refracts it.2) The iris regulates the size of the pupil which controls how much light is allowed to enter the eye. 3) Behind the pupil is the lens that focuses light (or an image) onto the retina .4) The retina contains many photoreceptor cells that convert light into electric signals.5) These signals are processed further then travel through the optic nerve to be collected and interpreted by the brain.