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not if you have total internal reflection
In all seriousness, wavelength-specific dielectric mirrors can approach six nines of reflectivity.
The hard part is hitting the mirror instead of the drone.
Just make the mirror as wide as the drone! Oh, wait…
And keeping the mirror surface clean
Yeah I guess you can’t pulse-ablate a mirror made of plastic.
Though it invites a backup strategy of spraying your enemies with molten drone.