Question

why does it take some time to see the object in a dim room when we enter the room from bright sunlight out side?

Answer 1

When the light is very bright, the iris contracts the pupil to allow less light to enter the eye. However, in dim light the iris expands the pupil to allow more light to enter the eye. So,it takes some time to see objects in a dim room when you enter the room from bright sunlight outside

Answer 2

In bright sunlight,the iris contracts the pupil to allow less light to enter the eye and in dim light,the iris expands the pupil to allow more light to see the object clearly.