Optical theory progressed within the mid-seventeenth century with treatises published by philosopher René Descartes, which spelled out various optical phenomena like reflection and refraction by assuming that light was emitted by objects which created it.[26] This differed substantively from the ancient Greek emission idea. From the late 1660s and early https://soundbar75184.blogscribble.com/29944278/how-music-online-can-save-you-time-stress-and-money