Christiaan Huygens (1629-1695) worked out a mathematical wave principle of light in 1678, and posted it in his Treatise on light in 1690. He proposed that light was emitted in all directions like a number of waves in a medium called the Luminiferous ether. As waves are certainly not https://lightsteelstructurevilla76654.isblog.net/new-mobile-homes-an-overview-55970970