Explain the working of human eye step by step
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Human eye is a natural optical instrument which is used to see the objects by human being. It mainly consider of 7parts
1. Retina-it is a light sensitive screen inside the eye on which image is formed. Contains rod cells and cones cells.
2.cornea -it is a thin membrane which covers the eye ball. It acts like a lens which refracts the light entering the eye.
3.eye lens- it is a convex lens made of transparent and flexible jelly like materials.
4.pupil-it is a hole in the middle of iris through which light enters the eye.
5.ciliary muscles -these are the muscles which are attached to the eye lens and can modify the shape of eye lens which leads to the variation in focal lengths.
6.iris-it control the amount of light entering the eye by changing the size of pupil
7.optical nerve -these are the nerve which take this image to the brain in the form of electrical signal.