Before revision: The law of refraction says that the refracted ray lies in the plane of incidence, and the sine of the angle of incidence divided by the sine of the angle of refraction is a constant: , where is a constant for any two materials and a given colour of light.
After revision: The law of refraction says that the refracted ray lies in the plane of incidence and the sine of the angle of incidence divided by the sine of the angle of refraction is a constant: , where is a constant for any two materials and a given colour of light.