This quantity is related to the number of particles times mean polarizability by the Lorentz-Lorenz equation. This quantity can be negative in left-handed metamaterials. This quantity changes linearly in response to an electric field in Pockels effect, and it changes quadratically with the electric field in the Kerr effect. (10[1])Taking the arctangent (10[1])of the ratio of two values of this quantity gives Brewster’s angle. (10[1])The ratio of two values of this quantity (10[1])equals the ratio of the sines of two angles in Snell's law. For (10[1])10 points, dividing the speed of light by the speed of light in a medium gives what quantity that measures how much light bends in a medium? ■END■ (10[1])