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 as being a number of waves in the medium called the Luminiferous ether. As waves are certainly https://prefabricated-house00887.ambien-blog.com/45655686/not-known-details-about-light-steel-frame-houses