Question

what happens when u enter adim lightly room from bright sunlight and why

Answer 1

we wont get a clear vision. it is because in bright light ciliary muscles contract and allow only few light to enter and in dim light they expand to absorb more light. during this time of change of ciliary muscles u wont get clear vision.

Answer 2

When you enter a dark room, your iris contracts, thereby increasing the size of the pupil to let more light enter your eyes, to make objects in the dim room visible.

In bright sunlight, the iris expands and the pupil contracts so that less amount of light enters the eye.

Hope it helped!
NISHTHA.