This is called refraction. The frequency of light does not change as it refracts. The refractive index of a material is a measure of the change in the speed of light as it passes from a vacuum (or ...

In all ray diagrams, all angles of incidence and refraction are measured between the ray and the normal. Watch this video for a practical demonstration of measuring the refractive index of glass.

The Fisher Scientific™ Abbe Bench-top Refractometer measures refractive indices of liquid and solid samples at D-line (589nm), featuring a combination of the Brix and refractive index (nD ...