Christiaan Huygens (1629-1695) worked out a mathematical wave idea of light in 1678, and printed it in his Treatise on light in 1690. He proposed that light was emitted in all directions for a number of waves inside a medium called the Luminiferous ether. As waves are certainly not https://prefabricatedhouse09987.activablog.com/38142233/prefabricated-house-for-dummies