Christiaan Huygens (1629-1695) worked out a mathematical wave principle of light in 1678, and printed it in his Treatise on light in 1690. He proposed that light was emitted in all Instructions as a number of waves in a medium called the Luminiferous ether. As waves are not afflicted https://lightgaugesteelframehouse66543.blogrelation.com/45525989/indicators-on-prefab-office-building-you-should-know