When we enter a dim-lit room from a bright light, we are not able to see the object in the room for some time.
Explain, why?
Or
Why does it take some time to see objects in a cinema hall when we just enter the hall from bright sun light? Explain.
In a bright light, the iris contracts the pupil of an eye to allow less light to enter the eye. When, we enter the dim-lit room, iris takes time to expand the pupil of an eye to allow more light to enter the eye so that the visible image of the object lying in the room are formed on the retina of the eye.