One way to derive this is by applying the general boundary conditions of Maxwell's equations.
One way to derive this is by applying the general boundary conditions of Maxwell's equations. Another way to derive this law uses Fermat's principle of least time. In birefringent materials, the ordinary ray obeys this law, while the extraordinary ray does not because this law only holds for isotropic media. This law states that sine theta one over sine theta two is equal to v one over v two, where v is the local velocity of light. FTP, name this law that describes the refraction of light at the boundary of two media.
One way to derive this is by applying the general boundary conditions of Maxwell's equations.
Snell's law (accept also Descartes's law and the Snell–Descartes law; prompt on the law of refraction before mention)