Hi i bought a 50mw laser that u can pretty much see the beam line at night. Anyone know if its possible to change the distance length it emits from 10 miles to like say 3 feet instead.
Lol. If i find a way i guess ill repost back here.
The distance that the beam is visible to at night depends on the brightness of the light, and how much dust and crap is in the air, as well as how well focused the beam is. There isn't a good way to limit the distance of this other than having it hit something.
The point Mike and I are trying to make is that, assuming it is not blocked, the beam goes on forever. It does not stop after a certain distance. Its intensity drops according to 1/r^2 in a vaccum, so if you move twice as far away, the intensity drops to one quarter of the intensity at the source.