2 ms·
imagine a world where this was the norm. You wouldn't need to worry about outages due to falling trees or utility poles exploding or people screwing with your w
by kbar13 12y ago
imagine a world where this was the norm. You wouldn't need to worry about outages due to falling trees or utility poles exploding or people screwing with your wires.
Then you step outside to look up at the sky and you lose your eyesight
- deleted 12y ago[deleted]
- mnw21cam 12y agoDay of triffids scenario aside, no you won't lose your sight from a 2.5W laser pointing downwards from 260 miles up. The power level is too small. People think that lasers produce a parallel beam. They don't - they are diffraction limited by the width of the beam. The narrower the beam, the more it spreads out. For example, a 1cm wide beam produced by a perfect laser would spread out to around 20m wide when it hits the ground from 260 miles away. That's assuming visible green light - if it's infra-red (or even just red) then the spread will be wider.
- kahirsch 12y agoBut it wouldn't work on a cloudy day, presumably.