Of course if you cannot view this video in your own country, just go onto You Tube and type in,"How This Guy Makes Amazing Mechanical Mirrors Obsessed Wired".
FYI, weaponised mirrors have been in use since May 16th 1960 when Theodore H Maiman at Hughes Research Labs in Malibu California, invented the very first working Ruby Laser Beam? ...
In the novel Ringworld, Niven described a kind of "sunflower" growing in the inhabited portion of the megastructure that had mirror-reflective petals. If it detected any animals in it's field of vision, it would move the petals to reflect the sunlight towards the creature. When you have a huge patch of them, it would become a deadly blast of sunlight.
So some of the hominids living there would build structures with angled rooftops that created a field of devastation in a particular direction that attackers of other hominid groups could not penetrate.
It was a cool idea. To make mechanical version of such a plant, you'd just need little servos to control the mirrors, some kind of laser ranging and motion detection, and a micro-controller to compute the angle of each mirror to put the sunrays on the target.
It obviously wouldn't need power, since you could embed a solar cell in every nth panel, and have the microcontroller direct that to maximize power. It's not like you need a battery or anything, since it would not work at night.
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