(i) Cornea: The front part of the eye is cornea and it controls and focuses the entry of light into the eye. It also acts as a convex lens and converges most of the light rays entering the eye.

(ii) Iris: The iris automatically adjusts the size of the pupil according to the intensity of light received by the eye. The iris regulates the amount of light entering the eye and falling on the retina.

The diagram is shown below: