Light and civilization is synonymous and the search for light’s nature and speed was at the center stage of human mind. Galileo first tried to measure the speed of light and from then for the next four hundred years the search continued. In this search the nature of light and its medium of propagation raised many questions. Newton’s corpuscular theory or Huygen’s wave theory had their own supporters. But everyone was sure about eluding medium named ether to sustain the light. Progress in research shattered the existing belief and gave rise to a new era in the understanding of the universe