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Name the part of the eye:
(a) which controls the amount of light entering the eye.
(b) on which the image is formed.
(c) which changes the focal length of eye-lens.
(a) The iris is the part of the eye that controls the amount of light entering the eye.
(b) The retina is the part of the eye on which the image is formed.
(c) The ciliary muscles change the focal length of the eye lens.
Explanation
Iris is a flat, coloured, ring-shaped membrane behind the cornea of the eye, which controls the amount of light entering the eye by automatically adjusting the size of the pupil according to the intensity of light.
Retina is a screen at the back part of the eye and behind the eye-lens where the image is formed.
Ciliary muscles are circular muscle which changes the thickness of the eye-lens while focussing by changing its shape and thereby enable us to see objects that are near or far away.
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