Under standard conditions on a flat surface the angle of incidence will equal the angle of reflection, that is if a ray hits the surface at a 30 degree angle it will reflect at a 30 degree angle, but the path of the ray will be in the opposite direction. Hence it can be said to have been flipped around the normal (line perpendicular to the surface). | Under standard conditions on a flat surface the angle of incidence will equal the angle of reflection, that is if a ray hits the surface at a 30 degree angle it will reflect at a 30 degree angle, but the path of the ray will be in the opposite direction. Hence it can be said to have been flipped around the normal (line perpendicular to the surface). |