Why can a matte surface be seen from any position, but not a mirrored one?

In the case of diffuse reflection, the surface is visible at any position of the eye, since it receives rays reflected from the surface, which have a different direction. In the case of specular reflection, the reflected rays have only one direction.

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.