One definition of this quantity gives it as the square root of the product of the relative permittivity and the relative perm
One definition of this quantity gives it as the square root of the product of the relative permittivity and the relative permeability. Birefringent materials are anisotropic, meaning their value for this quantity is different along different axes. This quantity, about 1.33 for water, is found in a law which states that the ratio of this value for two different materials is equal to the inverse of the ratio of the sines of the angles of incidence; that law is called Snell's law. For 10 points, name this quantity equal to the ratio of the speed of light in a vacuum to the speed of a light in a medium.
One definition of this quantity gives it as the square root of the product of the relative permittivity and the relative permeability.
{index of refraction}