006 - III On Refraction Part 2

Published in 1690, Treatise on Light stands as one of the most significant scientific works on light prior to Newtons Opticks. This groundbreaking book delves into the nature of light, exploring its velocity and the fascinating phenomena of refraction and reflection. A substantial section is dedicated to the intriguing double refraction found in Iceland crystal, with all findings meticulously demonstrated through geometric proofs. Authored by the influential physicist and astronomer Christiaan Huygens (1629 - 1695), known for his pivotal discoveries in centrifugal force and the wave nature of light, this treatise offers a glimpse into the scientific discourse of his time, alongside contemporaries like Galileo and Descartes. Huygens was also a distinguished member of the French Royal Society from 1663. (Summary by Availle)