India celebrates 28 February every year as ‘National Science Day’ because on this day in 1928, C. V. Raman discovered what was later called the ‘Raman Effect’. The Raman Effect is the scattering of light by a substance, resulting in a change in the wavelength of the light. It is named after its discoverer, Indian physicist C. V. Raman. The Raman Effect is a very important phenomenon in physics and chemistry, and it has many applications in different fields. For example, it is used in Raman spectroscopy, which is a technique used to study the structure of materials. The Raman Effect is also used in Raman imaging, which is a technique used to create images of materials.
The other options are incorrect. Option A is incorrect because the first Indian Spacecraft was launched on 19 April 1975. Option B is incorrect because Nehru did not lay the foundation of Science labs all over India. Option C is incorrect because Vikram Sarabhai was born on 12 August 1919.