Tyndall Effect
Tyndall Effect : When a beam of light passes through a substance, e. g. air, containing small particles, light is scattered in all directions. If the particles are very small, light of short-wave lengths (blue light) is scattered most and light of long-wave lengths (red) least. Thus a cloud of smoke reflecting light usually looks bluish; but it looks reddish (white which has lost some blue) if the light is transmitted through it
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