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.

(a) The part of the eye which controls the amount of light entering the eye is iris.

(b) the part of the eye on which the image is formed is retina.

(c) the part of the eye which changes focal length of eye-lens is ciliary muscles.