Why do we see light and how does it interact with our eyes and brain to create the sensation of vision?

We see light because it is a form of electromagnetic radiation that travels in waves. When light enters our eyes, it is focused by the lens onto the retina at the back of the eye. The retina contains cells called photoreceptors that convert light into electrical signals. These signals are then sent to the brain through the optic nerve, where they are processed and interpreted as images. This process allows us to perceive the sensation of vision.