National Science Day is celebrated each year on 28 February to commemorate the discovery of “Raman Effect” in 1928 by Sir Chandrasekhara Venkata Raman, which led to the Nobel Prize being awarded to him in the year 1930. Since that day, February 28 is being commemorated as National Science Day to recall the great discovery of CV Raman. The purpose of celebrating this day is to enhance scientific temper, popularization of science and encouraging innovative activities by infusing scientific temperament in the masses and to create a positive scientific research culture.
About Raman effect
Raman effect, change in the wavelength of light that occurs when a light beam is deflected by molecules. When a beam of light traverses a dust-free, transparent sample of a chemical compound, a small fraction of the light emerges in directions other than that of the incident (incoming) beam.