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 inside a medium called the Luminiferous ether. As waves are certainly not https://steelframevilla88765.ja-blog.com/39152786/the-smart-trick-of-lightweight-steel-frame-houses-that-nobody-is-discussing