Simple experiment: Take a standard laser pointer and shine it anywhere. Do you see the beam? No, only the beginning and end (though you might wind up in the hospital if you look into the beam).
Laser beams are composed of parallel waves (or photons, depending on how you look at it), and you cannot see a laser beam in the Earth's atmosphere (on a normal day). The only time you can see the beam (or rather part of it) is when you shine it through a medium that scatters light, say for example, through a very dusty room.
Simple experiment: Take a standard laser pointer and shine it anywhere. Do you see the beam? No, only the beginning and end (though you might wind up in the hospital if you look into the beam).
Laser beams are composed of parallel waves (or photons, depending on how you look at it), and you cannot see a laser beam in the Earth's atmosphere (on a normal day). The only time you can see the beam (or rather part of it) is when you shine it through a medium that scatters light, say for example, through a very dusty room.