How does the sight and hearing works?

Sight involves light entering the eye and being focused by the lens onto the retina, where light-sensitive cells called photoreceptors convert light into electrical signals that are sent to the brain through the optic nerve. Hearing involves sound waves entering the ear and traveling through the ear canal to the eardrum, causing it to vibrate. These vibrations are then transmitted by the ossicles in the middle ear to the cochlea in the inner ear, where hair cells convert the vibrations into electrical signals that are sent to the brain via the auditory nerve.