No mirror is perfectly 100% reflective. Whatever energy isn't getting reflected is heating/burning up the target. So with very powerful lasers, mirrors could offer some protection but not immunity. Depending on the reflectiveness of the mirror, the range of frequencies it reflects, and the frequency and power of the laser, the mirror could be melted through in no time.Heres an idea... mirrors! ;) Id like to see what happens when I fire my reflective armour coated missile at your fortress... good luck! :)
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