Question

the laws of reflection of light was good for

Answer 1

The law of reflection states that the incident ray, the reflected ray, and the normal to the surface of the mirror all lie in the same plane. Furthermore, the angle of reflection is equal to the angle of incidence . ... This type of reflection is called diffuse reflection, and is what enables us to see non-shiny objects.

Answer 2

1. Simplest and most significant importance of reflection is guidance of light energy at a desired path where we must reflection in particular ratio as per design of any experiment or event normally termed folding / changing path of a ray
2. Opposite to this most of reflections not desired by experiment or imaging are source of noise in image or signal and there we need zero or reduced reflection usually by antireflection coatings.