Light reflection and refraction

Let us distinguish between a reflection and a refraction,  reflection is the bouncing back of light when it  hit a surface, or in other word it is the returning back of light . When light completely return through same path, this called reflection at 180 degree, there  are two types of reflection, reflection by smooth or rough surface called secular and diffuse reflection respectively.

 While

 Reflection is the changing in direction of light when it changes a medium, when light from a lighter medium enters a denser medium it bends toward the normal and when bends away from the medium when it move from a denser medium to a lighter medium.