What Are Oblique Angle Rays?
When a ray of light travelling through the air strikes the surface of a piece of glass at an oblique angle, they form oblique angle rays. As a result one side of the wave enters the glass while the other side continues to traverse at its original speed until it teaches the glass. As a result, the ray refracts or bends inside the glass. This is nothing but refraction of light which is based on the fact that light travels with great speed in some media compared to others. An incident ray after bending becomes a refracted ray. In general, a ray is refracted away from the normal when it goes into a less dense medium and is refracted toward the normal when it goes into a denser medium.
