Answer:
Refraction
Step-by-step explanation:
The wave interaction shown is called refraction.
- Refraction occurs when a wave crosses the boundary between two medium
- In this process the ray becomes bent.
- The density difference between the two medium accounts for the bending of the rays.
- When a ray crosses the boundary from a less dense to a denser medium, it is deflected to the normal as the ray slows down.