Different <em><u>reflections</u></em> of light through two separate mediums causes the bending of wave fronts associated with light rays.
<h3><u>Explanation;</u></h3>
<em><u>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. </u></em>
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.