Optical idea progressed from the mid-seventeenth century with treatises prepared by philosopher René Descartes, which described a variety of optical phenomena such as reflection and refraction by assuming that light was emitted by objects which produced it.[26] This differed substantively from the ancient Greek emission theory. Within the late 1660s https://felixubgmo.blogvivi.com/30452084/facts-about-waterproof-bluetooth-speaker-revealed