Demonstrate scattering by an experiment.

Explanation

Aim: To show the scattering of light.
Material required : Breaker, Sodium thiosulphate , Sulphuric acid.
Procedure: 1) Take a solution of sodium-thio-sulphate (hypo) and sulphuric acid in glass beaker.
2) place the beaker in an open place where abundant sun light is available .
3) Watch the formation of grains of sulphur and observe the changes in the beaker.
4) We will notice that sulphur participates as the reaction is in progress. At the beginning , the grains of sulphur are smaller in size and as the reaction progress, their size increases due to precipitation.
5) Sulphur grains appear blue in colour at the beginning and slowly their colour becomes white as their size increases.
6) The reason for this is scattering of light.
7)At the beginning, the size of grains is small and almost comparable to the wavelength of blue light. Hence they appear blue in colour.
8) As the size of grains increases, their size becomes comparables to wavelength of other colours.
9) As a result, they acts as scattering centres of all colours.