Application of Scattering of Light in Daily Life ,Class - 10(Physics)

 Question -  Why Clouds are White?

   Answer :- Clouds are made of water droplets of different size. These different sized droplets are scattered in different colours for example , The tiniest droplets scatter more  blue light than other colours .The droplets of size greater than the tiniest droplets scattered more green light and the largest droplets scattered more red light. As, all the colours are scattered by the droplets in the clouds , so the result light is white. hence , clouds appear white.

White Clouds

 Question:-  Why danger signals are of red colour?

 Answer:-  When light falls on the signal , all colours are scattered  more than that of red colour , so the red colour suffering least scattering remains confined around the signal , which in turn illuminates the signal significantly. Thus the danger signals can be seen from very far off distances. Moreover , among all colours ,Red colour or red light is scattered least by smoke or fog . Hence , red signals are visible even through the smoke or fog.