Diffraction affects laser beams just like all other radiation. You can't just focus a laser beam on a pea over a distance of 1000km. (well, theoretically you co

Diffraction affects laser beams just like all other radiation. You can't just focus a laser beam on a pea over a distance of 1000km. (well, theoretically you could, but you need a 20m parabolic mirror to focus it)