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 (-5[1])metamaterials. This quantity (10[1])changes linearly (10[1])in response to an electric field in Pockels effect, and it changes quadratically (10[1])with the electric field in the Kerr effect. Taking the arctangent of the ratio of two values of this quantity (-5[1])gives Brewster’s (10[1])angle. The ratio of two values of this quantity equals the ratio of the sines of two angles in (10[1])Snell's law. For 10 points, (10[1])dividing the speed of light by the speed of light in a medium gives (10[1])what quantity that measures how much light bends in a medium? (10[1])■END■ (10[1])