Stand Laser How far does the laser from a laser pointer go?
If there were people on the moon for example, could they see my laser pointer if I somehow managed to aim it on the surface close to where they were standing?
And light is just made up of photons, so could one actually count the # of photons in a beam of light? I mean theoretically, are photons quantifiable?
People on the Moon would probably not be able to see your pointer. The beam from even the best lasers diverge somewhat so by the time light from a pointer reaches the distance of the Moon the intensity would be too low to be detected by eye. I'm sure there are some instruments that would be able to detect the light however.
I suppose you could count the # of photons in a beam of light. Some astronomical instruments detect only a very few photons from far away objects. Since the energy of a photon is h x f where h is Plank's constant and f is the frequency and since lasers are nearly monochromatic--one frequency--we could measure the intensity of the laser and divide by the energy of each photon and 'calculate' the # of photons.
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is the difussed refllection of a 1500mw IR laser dangerous 4 my eyes?
when the laser is directed at a wall with no refelecting properties is it still as dangerous as it would be if the beam was directed at a reflectable surface - if i am standing 6 feet away from that way. how will i know if i have incidently been hit by the beam?
Well, you have given two different conditions, first the diffuse reflection, then the "no reflecting properties" in the latter case, as there is no reflection there is no danger. But for the fist case there well could be some danger, if the diffusion is "perfect" the danger is probably minimal at 6 feet, but if the diffusion is not ideal there could be significant danger. You should be wearing eye protection in any case. I suppose if you go blind you will know you have had a significant exposure, but for a limited exposure I'm not sure how you'd know.
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