When a ray of light is incident at normal incidence ... any other angle, the ray changes direction as it refracts. The dotted line is the normal (perpendicular) to the surface. In refraction ...

Angle of incidence i = angle between the incident ray and the normal. Angle of refraction r = angle between the refracted ray and the normal. Glass is denser than air, so when light passes from ...

So, the amount of refraction for different media ... irrespective of the angle of incidence. (i) Ray diagram showing the path of rays of light when it enters with oblique incidence from air ...