"normal" mirrors don't really work for high-power lasers. If you try to reflect a high-power laser with your bathroom mirror, in the (very short) first moment i

"normal" mirrors don't really work for high-power lasers. If you try to reflect a high-power laser with your bathroom mirror, in the (very short) first moment it will reflect most of the beam, the part that's not reflected will burn the mirror and suddenly it's not a mirror anymore in the spot that the laser hits.