REFRACTION OF LIGHT

Refraction of light is bending of light away from the normal as it passes from one material to another.according to the law of refraction of light given by snells if light enters from one medium to another it is either refracted away from normal or towards normal,the incidence ,normal and refracted rays of  light all lie on the same medium.every object has its own refractive index which can be calculated by snell's relation mathematically as sin<i / sin<r  = n so refractive index can be defined as the ratio of the angle of incidence to the angle of refraction.is it possible that reflection and refraction occurs simultaneously?yes certainly it happens when we object outside the fast moving train then reflection and refraction occurs simultaneously.