The correct answer is option 2, i.e. Scattering of light. Sir C.V.Raman awarded with Nobel Prize in Physics in 1930.
He discovered that when light traverses in transparent material then some of the light changes its wavelength and amplitude.
This phenomenon of scattering of light is known as the Raman effect.
He was the first non-white, Indian or Asian person to receive Noel Prize in the field of Physics.
He and his student K.S. Krishnan discovered Raman effect on 28 February 1928 which is celebrated as National Science Day by the Government of India in commemoration of the discovery.
The Nobel Prize is given yearly by the Royal Swedish Academy for those who have made contributions in the field of physics for the whole of mankind.
It was established by the will of Alfred Nobel in 1895.
Since 1901, the Nobel Prize has been awarded in the fields of physics, chemistry, physiology or medicine, literature and peace, while a memorial prize in economic sciences was added in 1968.