Treatise on Light :
Huygens, Christiaan, 1629-1695
Treatise on Light : In which are explained the causes of that which occurs in reflexion, and in refraction and particularly in the strange refraction of Iceland crystal [electronic resource] / Christiaan Huygens - Project Gutenberg, 2005 - Project Gutenberg 14725 .
Public domain in the USA.
Electronic text
Refraction, Double Wave theory of light
QC
Treatise on Light : In which are explained the causes of that which occurs in reflexion, and in refraction and particularly in the strange refraction of Iceland crystal [electronic resource] / Christiaan Huygens - Project Gutenberg, 2005 - Project Gutenberg 14725 .
Public domain in the USA.
Electronic text
Refraction, Double Wave theory of light
QC