Answer:
Diffuse reflection
Step-by-step explanation:
When light rays falls on a polished surface it bounce back into the same medium after striking. This is called reflection.
There are two types of reflection.
Regular reflection and diffuse reflection
When a parallel rays of light falls on a smooth and highly polished surface, then after reflection they are also parallel to each other. It is called regular reflection.
When parallel rays of light fall on a rough and unpolished surface, then after reflection they are not parallel to each other. This phenomena is called diffuse reflection.