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Refraction.
As with any surface, some of the light will be absorbed by the surface and some will be reflected. If the surface is rough, then the reflected light leaves the surface in a huge number of different directions and so the original beam is not reflected coherently, but is instead scattered in myriad directions.
diffuese
Diffused reflection.
abrasive means to smooth out a rough surface
interference
rough, unpolished: raw, unrefined, imperfect, unfinished, incomplete
Something rough and unpolished can be described as rugged, raw, or unfinished.
your head
Coarse
A rough diamond is a term often used to describe a person who is worthy but unpolished. Just like a rough diamond has potential to be valuable once cut and polished, this person has potential for greatness with some refinement and guidance.
Refraction.
As with any surface, some of the light will be absorbed by the surface and some will be reflected. If the surface is rough, then the reflected light leaves the surface in a huge number of different directions and so the original beam is not reflected coherently, but is instead scattered in myriad directions.
It means something or someone is unpolished but has potential. For example, a child with obvious talent or an entry-level employee who shows potential might be referred to as "diamond in the rough"."In the rough" is a diamond that is as found, unpolished or uncut, still in rough form--this is not always even recognized as valuable, since it is not obvious in its rough form as a beautiful stone.
Well, would you care to have a rough, unpolished knife in your kitchen.
Granite counter tops are usually sanded and polished to create a smooth surface. A design element that is used sometimes is to keep the edges of a granite counter top rough or unpolished and unsanded to give a more natural look.
diffuese