Question

Describe the working of the human eye with the help of the above diagram. 

Answer 1

Working of the human eye:
The light from an object enters the eye through the cornea, a transparent substance. Behind the cornea, there is the iris, a ring-shaped membrane that has a hole in the middle called the pupil. The light passes through the pupil and falls on the eye lens, which is a convex lens made of a transparent, jelly-type material. Suspensory ligaments are attached to the eye lens on one end  and to the ciliary muscles on the other end. The eye lens converges the light rays to form a real and inverted image of the object on the retina with the help of light-sensitive cells and generates electric signals. The signals are conveyed to the brain through the optic nerve, which then gives rise to the sensation of vision. There are no visual receptors at the junction of the optic nerve and the retina. This point is called the blind spot. The space between the eye lens and the retina is filled with a transparent, jelly-like substance called vitreous humour, which supports the back of the eye.