Is it possible to have a "weapon" which is a mirror? like it comes up just as a rear view mirror if youve ever played a racing game, and you can see exactly what is going on behind you, either in reverse or not? so that if youve ever been killed by a jedi from behind, you wont be anymore.
is there a way to do this?

X-ray goggles, multiple detonators, and mirrors

They say it cannot be done. I believe there's a workaround for everything. Look at the grappling hook. Mav's already got one working, and I've got an idea for a grapple cable. So, if it's very crucial to you, go ahead and try to think of a workaround. Personally, I'd love to see one appear.