The image of objects is formed on light sensitive Retina in our eyes from where it is transmitted through the optical nerve to the brain. The retina has a large number of  light sensitive cells which are of two types:

i) Rods (which are Rod shaped)

ii) Cones(which are Cone shaped)

These have different functions.

The Rods are sensitive to the intensity of light and detect the degree of brightness of light. The cones are sensitive to colors of light.

They are responsible for ability of human eye to see colors.

There are infact 3 types of cones

i) one corresponding to Red
ii) one corresponding to Green
iii)one corresponding to Blue 

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