Consider the physical bodies around you. Find among them those that reflect light specularly, and those that reflect light diffusely. What does the surface of those and other bodies feel to the touch?
Specular reflection – the surface is smooth. In addition to the usual mirror, examples of mirror surfaces are glass, polished furniture, calm surface of water, etc.
Diffuse reflection – rough surface. Light from headlights, from a matte surface, from any object with an uneven surface.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.