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Treatise on Light

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Treatise on Light was published in 1690 and is probably the largest scientific volume on light published before Newton's Opticks. The book explains how light travels (i.e., that it has a certain velocity), and what happens when it hits a surface (refraction and reflection). A large portion of the book is devoted to the double refraction occurring in Iceland chrystal, and all drawn conclusions are proved geometrically.

Christiaan Huygens (1629 - 1695) was a prominent physicist and astronomer. His main discoveries are the centrifugal force, collision laws for bodies and the argument that light consists of waves. He was a contemporary of Galilei and Descartes, and a member of the French Royal Society since 1663. (Summary by Availle) (4 hr 43 min)

Chapters

Preface and Note by the Translator

9:27

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I: On Rays Propagated in Straight Lines, Part 1

23:13

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I: On Rays Propagated in Straight Lines, Part 2

21:10

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II: On Reflexion

12:14

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III: On Refraction, Part 1

13:04

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III: On Refraction, Part 2

23:38

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IV: On the Refraction of the Air

13:42

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V: On the Strange Refraction of Iceland Chrystal, Part 1

22:17

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V: On the Strange Refraction of Iceland Chrystal, Part 2

40:05

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V: On the Strange Refraction of Iceland Chrystal, Part 3

29:05

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V: On the Strange Refraction of Iceland Chrystal, Part 4

26:12

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VI: On the Figures of the Transparent Bodies, Part 1

21:42

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VI: On the Figures of the Transparent Bodies, Part 2

27:32

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