Question

Function of cornea, iris ciliary muscles and crystalline lens

Answer 1

here

Cornea is the membrane covering the front of the eye that is bulged out and is responsible for the maximum refraction of the light that enters the eye.

Iris forms the coloured part of the eye. It adjusts the size of the pupil, thereby controls the amount of light entering the eye.

Ciliary muscle helps in adjusting the focal length of the lens by contraction or relaxing.

The crystalline lens focus the light rays entering in the eye   and forms the image on retina. The focal length of the lens is controlled by ciliary muscles according to the need  

Answer 2

Answer:

1) CORNEA- Controls the amount of light entering in eye.

2) IRIS- Controls the size of pupil and the colour of the eye.

3) CILIARY MUSCLES - Controls the focal length of the eye lens.

4) CRYSTALLINE LENS - Form the image on retina.

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