Does the point at which two light beams coincide appear to be more visible/greater intensity than the beams themselves?
Specifically, i'm interested to know if the coincident point of two laser beams would appear to have a greater brightness / intensity than the beams themselves. For example, I think I read somewhere that 15-25mW green laser diodes have a visible beam in med-low light conditions because they offset dust particles? So does this mean that where there are two light sources approaching from different angles that there will appear to be a greater amount of reflection from the dust particles?
Any information would be useful really, just to put my mind at ease...