Wolfram|Alpha has refraction calculators. Solve problems related to the index of refraction of seawater, the refractive index, Brewster's angle, the optical absorption coefficient of ice (Ih phase), the refractive index of ice (Ih phase), the wavelength of light in a medium compared to another medium, the wavelength of light in a medium compared to the vacuum, the refractive index of moist air, refraction in a prism, rainbow altitude, Snell's law, total internal reflection and the refractive index of water.
