This quantity varies linearly with an applied electric field according to the Pockels effect.
This quantity varies linearly with an applied electric field according to the Pockels effect. It can be calculated via Sellmeier's law, while its path integral is stationary according to Fermat's principle. Left-handed metamaterials can have negative values for this quantity, which is expressible as the geometric mean of the relative permittivity and permeability of a medium. The ratio of this quantity at an interface is equal to the sine of the critical angle, according to Snell's Law. For 10 points, identify this quantity, the ratio of the speed of light in a vacuum to that in a given medium.
This quantity varies linearly with an applied electric field according to the Pockels effect.
{index of refraction} [or {refractive index}; prompt on {n} or {eta}]