Light waves are transfers which means the energy travels perpendicular to matter.
The reflection of light is what lets us see things. Light bounces off objects into our eyes. the light ray will hit a reflective surface (e.g a mirror) and will bounce back at the same angle on the other side of the normal line.
If a wave refracts all it is doing is bending/changing direction. this occurs when a wave enters a medium of different density. When they return to the/a medium of the original density, they will travel in the same direction as started.
Diffraction is just when the waves 'disperse', sort of. If the waves hit a barrier with a small opening, they will bunch up and spread out after the opening, on the other side.
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