> label on the one I have here) that the human eye isn't very sensitive > to it. The green ones lase at 532nm, which is near the wavelength > (~550nm) where the human eye is most sensitive, so the beam from a > green laser is much more visible than that from a red laser of the > same power, making the beam from a class 1 green laser pointer > visible in a dark room or outside at night (even when there are some > lights not too far away) as it reflects off moisture and dust > particles naturally present in the air.
I also forgot that a shorter wavelength means scattering at smaller particles (which a beam of longer wavelangth would "ignore"). The reason why blue light gets scattered by tobacco smoke (the causes the visible effect of the smoke appearing blue). - Klaus _______________________________________________ http://www.mccmedia.com/mailman/listinfo/brin-l
