Question

when a bright light is focused directly in the human an eye the eyeled shutoff. explain this phenomenon with an example

Answer 1

Hello!

The eyes are generally controlled by pupil . It controls the amount of
light entering to our eyes. If it is dark, pupil gets wider and eyes seems to be lar enough. {If at all bright light is concentrated the pupil gets closer and so our eyes gets closed }

Answer 2

We know that pupil controls amount of light entering the eye.

Hence, if large amount of light is forced on eye then eye will close down, where which pupil get smaller and smaller to decrease amount of light entering in eye.

This happens when a source of light get very close to eye.