The Mirror is polished smooth so that specular reflection occurs. The soda can have a rougher surface, so that diffusion reflection occurs.
Diffuse reflection reflects light in a variety of directions, as opposed to specular reflection, which reflects all light that comes from a single direction at the same angle.
The incident light is only reflected in one outgoing direction during specular reflection. On a surface known as a specular surface, which resembles a mirror, light reflects at the angle of incidence.
The finest example of specular reflection is found in mirrors, which have a highly reflective substance that reflects the whole visible light spectrum under the glass surface.
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