Here's why:
* Refraction is the change in direction of a wave as it passes from one medium to another. This change in direction is caused by the change in the wave's speed.
* Reflection is the bouncing back of a wave when it hits a surface.
* Diffraction is the spreading of waves as they pass through an opening or around an obstacle.
* Interference is the phenomenon that occurs when two or more waves meet.
Let me know if you have any other questions!
