We haven't had any complete solutions to this problem yet. However, Ruth has sent in some ideas for the first parts of the question. She says you can put a mirror across the middle or diagonally from corner to corner to see the whole square. She sent these diagrams:

I think there are other similar ways to see the whole square. Can you work out what they are? Thank you for writing to us Ruth, but the solution is not finished!

Come on - get out your mirrors and have a go!