Because the particles in cigarette smoke are very small, light  that passes through it will scatter, causing the smoke to appear  blue. In general, this scattering will occur anytime a beam of  polychromatic light hits a medium that contains particles with  diameters smaller than one-twentieth the wavelength of the light,  while the light will remain polychromatic for higher diameters.  FTP, name this phenomenon that explains why the sky is blue.
Because the particles in cigarette smoke are very small, light  that passes through it will scatter, causing the smoke to appear  blue. In general, this scattering will occur anytime a beam of  polychromatic light hits a medium that contains particles with  diameters smaller than one-twentieth the wavelength of the light,  while the light will remain polychromatic for higher diameters.  FTP, name this phenomenon that explains why the sky is blue.
Because the particles in cigarette smoke are very small, light  that passes through it will scatter, causing the smoke to appear  blue.