6 ms·

For 1) it's a flip along the axis of the mirror, not a rotation at all.

• _sword 12y ago
  Pretty sure I remember it being possible to do a 4 dimensional rotation that's equivalent to a 3D mirror image. I'm at work now though and can't do the math for a while
  • TTPrograms 12y ago
    Everything gets easier when you add dimensions - just ask the string theorists.
  • symmetricsaurus 12y ago
    Sure. Add an extra dimension with coordinate w to 3d space. Then just rotate around the (x,y)-plane until z -> -z and w -> -w. Everything in the (x,y)-plane stays the same and z has been inverted.
    • _sword 12y ago
      Thank you, that looks exactly right!