Optical theory progressed while in the mid-seventeenth century with treatises created by philosopher René Descartes, which described a number of optical phenomena such as reflection and refraction by assuming that light was emitted by objects which generated it.[26] This differed substantively from the ancient Greek emission theory. Inside the late https://opticalnearme85072.digitollblog.com/29688959/5-simple-statements-about-portable-pa-system-explained