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 for a number of waves inside a medium called the Luminiferous ether. As waves are certainly not https://modular-house56543.elbloglibre.com/39095489/not-known-facts-about-expandable-house