Answer this question from chapter THE HUMAN EYE

Dear student,
(i) Cornea. The front part of the eye is called cornea. It is made of a transparent substance which is convex in shape. The light coming from objects enters the eye through the cornea.
(ii) Iris. Iris is a flat, coloured , ring shaped muscle behind the cornea of the eye. There is a hole in the middle of the iris called pupil. The iris controls the amount of light entering the eyes.
(iii) Retina: To act as a screen to obtain the image of object and generate,electrical signals which are sent to the brain via optic nerves.
(iv) Ciliary muscles. The eye-lens is held in position by suspensory ligaments and ciliary muscles. Ciliary muscles change the thickness of eye-lens while focussing. In other words, the focal length of eye-lens can be changed by changing its shape by the action of ciliary muscles.
(v) Pupil: To regulate and control the amount of light entering the eye.

Regards

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