We are able to see when light from an object enters the eye. It passes through the cornea, then through the pupil at the center of the iris. Light then goes through the lens which bends the light rays towards each other to form an inverted image on the retina. The light rays are changed to electrical impulses which are criiied by the optic nerves to the brain to be interpreted. The brain interprets the image the right way up and we are able to see.
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