The currently-closed question asks, in essence,
Could someone [...] explain why the reflections [between two opposite mirrors] curve away instead of meeting at a perspective point within the reflections?
i.e. entirely a geometric affair.
The proposed duplicate asks what would happen if one of the mirrors were 'one-way' and the observation were done from behind it (in a pretty rambling way), involving a completely different set of concepts, and also an invalid premise (the existence of one-way mirrors) that requires careful unthreading in the leading answer that makes up the bulk of the required response, and which is entirely absent from the currently-closed question.
How on Earth are these two duplicates?