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Cornea of the eye is the first sight where convergence of light rays takes place.
Iris is that part of the eye which controls the amount of light entering the eye through the pupil.
Pupil is a type of small hole through which light enters the eye.
The eye lens is a convex lens just behind the pupilwhich converges the light rays towards the ratina.
The retina is a type of screen in the eye having light sensitive cells where the formation of image takes place