Question

Why does it take some time to see objects in a dim room when you enter the room from bright sunshine outside?

Answer 1

Hint: In this we will first need to know the basic construction of our eye and how it works when light rays fall on it. Our pupil size will change when the light in our surroundings changes. Here for easy understanding we will make a diagram representing the difference in the size of the pupil.

Complete answer:
Pupil is a hole in the middle of our iris, which appears black because the light that passes through it gets absorbed by the retina and this light cannot be reflected back.When low light or we can say when dim light enters into our eye the iris expands the pupil so as to increase the amount of light entering the eye and with the help of this our pupil can focus and is able to see through the dim light.

When bright light enters into our eye the iris contacts and the pupil reduces the amount of light entering the eyes so that too much light will not enter into our eye and we are able to see through it comfortably with no harm to our retina.

Hence from the above discussion we can say that when we enters into a darker room or dim room from bright sunlight at first we cannot see through clearly this is because in bright sunlight the pupil of our eye become small and when we just enter the darker room very little amount of lights will enter into our pupil and this is the reason that we can see propyl. But after a while when our eyes get enlarged then it will allow more light to enter into our eye and we can see properly.

Note: Remember that in case of bright light the pupil size becomes small so that enough light will not enter into our pupil. This is because more light will damage our pupil even if extreme bright light will make us blind. Also in case of dim light our pupil size increases so that more light enters into our eye and we can see. Keep in mind that the main working of the pupil is to control the amount of light entering our eyes.