INCIDENT light RAY or any EM wave, reflects off a SURFACE, the laws of reflection still holds, but the surface affects the way we see the reflected rays.Specular Reflection:It happens when a beam of light ‘or’ EM waves in general, is reflected “perfectly” (in parallel to each other) from a shiny, polished surface. Ex- mirrors, STAINLESS steel, glass, etc.Diffuse Reflection:It happens when a Beam of light is Reflected “irregularly” (in different directions) from an irregular surface. Ex- sheet fo paper, tabletop etc.This is explained with the help of the DIAGRAM shown:-