Lorentz-Lorenz relation

In physics, the Lorentz-Lorenz law relates the index of refraction n and the density ρ of a dielectricum

${\frac {n^{2}-1}{n^{2}+2}}\propto \rho$

The relation is named after the Dutch physicist Hendrik Antoon Lorentz and the Danish physicist Ludvig Valentin Lorenz.

References

• H. A. Lorentz, Über die Beziehung zwischen der Fortpflanzungsgeschwindigkeit des Lichtes der Körperdichte, Ann. Phys. vol. 9, pp. 641-665 (1880). Online
• L. Lorenz, Über die Refractionsconstante, Ann. Phys. vol. 11, pp. 70-103 (1880). Online