“National Science Day” is celebrated in India on 28th February every year. This day is celebrated to honour the Nobel Laureate- Sir C.V. Raman for his invention of the “Raman Effect” on 28th February,1928. Sir Chandrasekhara Venkata Raman was the first Indian scientist to be honoured with the prestigious Nobel Award in Physics in the year 1930. This day is also observed to recall & celebrate the contribution of all great scientist of India who made fundamental discoveries. Some of these are: Aryabhatta, APJ Abdul Kalam, Srinivasa Ramanujan & many others.
“Raman effect” or Raman scattering is popularly known as an inelastic scattering of a photon. When light is scattered from an atom or molecule, most photons are elastically scattered with almost the same energy (frequency) and wavelength as the incident photons. Yet, a small fraction of the photons is scattered by excitation. The frequency of scattered photons is lower than the frequency of the incident photons.