What is a 1-dimensional mirror?

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What is a 1-dimensional mirror? What is a 3-dimensional mirror? How much information does a mirror contain? DE
 

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A mirror (unless otherwise defined) is a hyperplane of the surrounding Euclidean space and mirroring a reflection of this space into the space behind the mirror with all points on the mirror fixed.

A mirror itself only contains the fixed points. But all points on the face side of the mirror are perpendicularly projected on this surface if you stand right in front of it.

The difficulty with your question is, that you neither defined mirror nor contain.
 

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