REFRACTION AT PLANE SURFACE
The phenomenon of change in path of light as it goes from one medium to another is called refraction.
Laws of refraction
- The incident ray, the refracted ray and the normal to the surface separating to two media at the point of incidence – all lie in one plane.
- Snell’s law: For a given pair of medium the ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant for a light beam of a particular frequency,
