Question

how are we able to see in dim and bright light

Answer 1

The light passes through cornea of the eye (cornea is the clear dome shaped covering of the eye). The cornea refracts the light and the iris regulates the size of the pupil, which controls the amount of light entering the eye. The lens, that is behind the pupil, focuses the light or the image into the retina. Retina contains "photo-receptor" cells convert light into electrical signals. These electrical signals are processed further, and then travel from the retina of the eye to the brain through the optic nerve, a bundle of about one million nerve fibers. We “see” with our brains; our eyes collect visual information and begin this complex process.

Answer 2

cones and rods r present in our eyes the cones helps us to see in bright light whereas the rods helps us to see in dim light.