Pretty sure the obstacles to positioning the drone/mirror precisely enough (and keeping the mirror clean enough) would be insurmountable, but couldn't help wondering.
>any dust on the mirrored surface would get burned in, and lead to the destruction of the target even faster than with a non-reflective surface.
Also, if you can build a mirror to bounce the laser you can use that same mirror to protect the target. But, N beams and N mirrors sidesteps this issue.
PS: An amusing idea is to use a fleet of drones with mirrors to cook the target using sunlight.
Also, if you can build a mirror to bounce the laser you can use that same mirror to protect the target.
For example the target can use a high deflection angle to disperse the beam. AKA you beam's intensity is sin X and as it covers 1 / (sin X) area. So full intensity = 90 degrees, and at 10 degrees your down to 17.4% intensity. For something like a Mortar rotation can also be a significant benefit.