A mirror is just a surface that reflects light, and white is just all colours mixed together, so a white surface is just one that reflects all light. So why is one monochrome whilst the other is a reflection?
In: Physics
If a beam of light hits a white surface, it scatters in all directions. If a beam of light hits a mirror, it reflects in one particular direction.
The result is that you can see reflected images in a mirror while a white surface just creates a single color that is a mash-up of all the incoming light.
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