National Science Day is celebrated every year on 28 February by the Government of India to commemorate the discovery of the ‘Raman Effect’. designated 28 February as in 1986.
On this day, Sir C.V. Raman announced the discovery of the ‘Raman Effect’ for which he was awarded the Nobel Prize in 1930
The Raman Effect is a change in the wavelength of light that occurs when a light beam is deflected by molecules.