Chapter : 5. Human Eye & Colourful World

Scattering of Light

Scattering of Light
The interplay of light with objects around us gives rise to several spectacular phenomena in nature. The blue colour of the sky, colour of water in deep sea, the reddening of the sun at sunrise and the sunset are some of the wonderful phenomena we are familiar with. The path of a beam of light passing through a true solution is not visible. However, its path becomes visible through a colloidal solution where the size of the particles is relatively larger.
(a) Tyndall effect
(b) Why is the colour of the clear sky blue
(c) Colour of the sun at sunrise and sunset

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