Optical principle progressed while in the mid-17th century with treatises written by philosopher René Descartes, which explained several different optical phenomena together with reflection and refraction by assuming that light was emitted by objects which generated it.[26] This differed substantively from the ancient Greek emission principle. While in the late https://kameronmnnkh.bloggazzo.com/29325506/5-simple-statements-about-royalty-free-music-explained