Descartes' treatise _Dioptrique_ was the first to state it as a ratio of sines, rather than the ratio of cosecants used by its Dutch namesake.
Descartes' treatise _Dioptrique_ was the first to state it as a ratio of sines, rather than the ratio of cosecants used by its Dutch namesake. FTP, give this law of optics stating that for light of a particular wavelength passing from one isotropic medium to another, the ratio of the sines of the angles of incidence and refraction is constant.
Descartes' treatise _Dioptrique_ was the first to state it as a ratio of sines, rather than the ratio of cosecants used by its Dutch namesake.
{Snell's} Law or the {Law of Refraction}