Can you explain why we can see a beam of light from a laser?

Answer 1

First it has to be a visible light laser. Some are invisible. Then the air has to have some type of particles floating in it to actually see the beam.. Something like smoke, dust or other "pollution". In clean air you can't see the beam.

Answer 2

If u "see" a light beam, depends on the length of the light wave, if it is between 400nm-750nm you can see it with our blank eye.

If u have a laser emitting waves in this wavelength, well u have to seem them.

I think that when the laser emits waves with not seeable wavelengths, the atoms in the way of the laser beam, get stimulated, and emit secondary waves. This waves again, can be in the viewable wave spectrum, or not.

Under http://en.wikipedia.org/wiki/Electromagnetic_spectrum
you can read a little bit about the wavlength and viewable spectrum of waves.

Answer 3

We can see a beam of light from a laser because it contains monochromatic light. It contains only one constituent of the seven colours which make up the white or visible light. If it is a white light, we can't see.

Answer 4

To explain the easiest way, visit

http://en.wikipedia.org/wiki/Laser

It is beautifully explained and there won't be need for any intellectual speculations.

Answer 5

Because all we can see is that which is light or is lit.