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 (10[1])linearly in response to an electric field in (10[1])Pockels effect, and it changes quadratically with the electric field in the Kerr effect. Taking the arctangent of the ratio of two values of this quantity gives Brewster’s (10[1])angle. (-5[1])The ratio of two values of this quantity equals the ratio of the sines of two angles (10[1])in Snell's law. (10[1])For 10 points, dividing the speed of light by the (-5[1])speed of light in a medium gives what quantity that measures how much light bends (10[1])in a medium? ■END■ (10[1]0[1])