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Why does it take some time to see objects in a dim room when you enter the room from bright sunshine outside?
It takes some time to see objects in a dim room when we enter the room from bright sunshine outside because it takes some time for the small pupil of our eye to expand (make the pupil large) so that enough light can enter our eyes and we can see clearly.
Explanation
It takes some time to see objects in a dim or dark room when we enter the room from the bright sunlight outside because in bright sunshine the pupil of our eye is small. Hence, as we enter a dim room, very little light enters our eyes and we can't see properly. After a short time, our pupil expands and becomes large, letting in more light into the eye and we are able to see clearly.
Pupil is a hole in the middle of the iris, which appears black because the light that passes through it, gets absorbed by the retina and is not reflected back. Its function is to control the amount of light entering the eye with the help of the iris so that it can be focused on the retina to begin the process of sight.
In low-light conditions, the iris expands the pupil to increase the amount of light entering the eyes, so that more light can reach the retina and make us able to see in dim or dark surroundings.
In bright conditions, the iris contracts the pupil to reduce the amount of light entering the eyes, so that too much light can't cause glare and discomfort to the eye, and even can't damage the lens and retina.
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