Parallel light rays (blue arrows) reflecting on a smooth surface (mirror) illustrates SPECULAR or REGULAR reflection while DIFFUSE or IRREGULAR reflection occurs when the same parallel light rays reflect on rough surface (The roughness of a surface is a matter of degree; what appears smooth to the unaided eye can be quite rough on the atomic scale) like a piece of cloth.
For regular reflection: Parallel incident light rays are reflected in one direction only and the normal are parallel with each other.
For irregular refelction: Parallel incident light rays are reflected in different directions and the normal are not parallel with each other.
However, the
LAW OF REFLECTION holds true in both SPECULAR reflection and DIFFUSE reflection
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