Answer;
Reflection
Different reflections of light through two separate mediums causes the bending of wave fronts associated with light rays.
Explanation;
- Reflection is the bouncing back of light upon hitting a boundary or a surface. It involves abrupt change in direction of propagation of a wave that strikes the boundary between two different media.
- When a wave front undergoes reflection at an interface between two different media it changes direction such that it returns into the medium it originated from.