The above photo is my first experiment with creating a 3D photo using a single mirror. I was disappointed with the result. The right side is the mirrored image. The problems could be that my mirror quality was not good enough, my setup was not quite right or the images need more editing, probably all three. It is more work in post processing than using twin cameras. I used Stereo Photo Maker.
See the excellent description on the technique at:
http://www.lhup.edu/~dsimanek/3d/stereo/3dgallery16.htm