This quantity is related to the number of particles times mean polarizability by the Lorentz-Lorenz equation. (10[1])This quantity can be (-5[1])negative in left-handed (-5[1])metamaterials. (10[4]-5[2])This quantity (10[1])changes (10[1])linearly (10[1]-5[1])in response to an electric (10[1])field in (10[1])Pockels effect, and it changes quadratically (10[1])with the electric field in the Kerr effect. (10[1])Taking (-5[1])the arctangent (10[1]-5[1])of the ratio of two (10[1])values of this quantity (-5[1])gives Brewster’s (10[2])angle. (10[1]-5[1])The ratio of two values of this quantity (10[1])equals (10[1])the (10[2])ratio (10[2])of the sines of two (10[1])angles (10[1])in (10[1])Snell's (10[1]-5[1])law. (10[4]-5[2])For (10[1])10 points, (10[1])dividing the (10[2])speed of light (10[1])by the (-5[1])speed of light in (10[2]-5[1])a medium gives (10[1]-5[1])what (10[1])quantity (10[1]-5[1])that measures (10[1]-5[1])how much light bends (10[3])in a medium? (10[3])■END■ (10[11]0[7])