Wolfram|Alpha has materials calculators. Solve problems related to the Clausius–Mossotti relation; the Debye or Lorentz–Lorenz equation; the Gladstone–Dale relationship; the Abbe number for helium, hydrogen or mercury; the Beer–Lambert law; the optical absorption coefficient of ice (I<sub>h</sub> phase); the refractive index of ice (I<sub>h</sub> phase), moist air or seawater; the specific rotation formula; and the optical absorption coefficient or refractive index of water.
