Treatise on Light: In Which Are Explained the Causes of That Which Occurs in Reflection & Refraction is a book by Christiaan Huygens, published in 1690. The book describes Huygens's theory of light propagation, which he believed to be a series of shock waves that travel through the ether. The book is considered a pioneering work of theoretical and mathematical physics. This book has an active table of contents:


PREFACE 3
NOTE BY THE TRANSLATOR.4
TREATISE ON LIGHT6
CHAPTER I 6
ON RAYS PROPAGATED IN STRAIGHT LINES. 6
CHAPTER II. 19
ON REFLEXION19
CHAPTER III 23
ON REFRACTION23
CHAPTER IV33
ON THE REFRACTION OF THE AIR33
CHAPTER V... 38
ON THE STRANGE REFRACTION OF ICELAND CRYSTAL38
CHAPTER VI. 72
ON THE FIGURES OF THE TRANSPARENT BODIES. 72
Which serve for Refraction and for Reflexion. 72
END 88
INDEX 88