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Smoke emitted by burning cigarette somet...

Smoke emitted by burning cigarette sometime appears to be light blue-Why?

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Smoke is a colloid (solid aerosol) in which fine dust particles (dispersed phase) are dispersed in air (dispersion medium). If smoke emitted from cigarette is seen at right angles with respect to the path of light, scattered blue colour reaches our eyes. This happens due to the scattering of light by C-particles. Hence, cigarette-smoke appears to be light blue.
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