Otherwise the image formed will be blurred and mostly distorted. That is why we expect the surface of the mirror to be optically plane. Hence smooth.
mirror
A mirror.
a mirror
shinny surfaces, example mirror.
That surface would be called a "mirror".
Specular reflection occurs when light bounces off of a smooth surface such as a mirror!
it is because a mirror has a smooth surface.
mirror
A mirror.
mirror
a mirror
Perfect surface preparation and spray application.
This could be a basic definition of a mirror.
Saturn's surface has not been proven to be smooth. One of Saturn's moons have been confirmed to be smooth and mirror like though.
shinny surfaces, example mirror.
That surface would be called a "mirror".
A regular reflection.