Christiaan Huygens (1629-1695) worked out a mathematical wave idea of light in 1678, and revealed it in his Treatise on light in 1690. He proposed that light was emitted in all directions for a series of waves inside a medium known as the Luminiferous ether. As waves usually are https://light-steel-frame-houses55432.bloggerbags.com/44498877/the-2-minute-rule-for-light-gauge-steel-framing