A mirror is used to reflect Electromagnetic radiation and in Air-port security or Medical facilities they use X-rays to detect anomalies in-side objects however I'm always puzzled what if I add a mirror inside the luggage or put a mirror in front of me.

That in mind, how would x-ray scanner see the mirror or would it be invisible? I'm sure I am not the first one to think of this as a lot of security and criminals thought of this however I never got my answer so can someone tell me please?