LASER

Readers may be bored by my "LASER" pics, so I'm not going to be short this time round. This picture is interesting because you can see the mechanism inside:


The diffraction pattern ... yawn yawn ... ok, just like to note that the red dots are farther apart then the green. This is due to the longer wavelength of red light. Trivial? well if not for the difference in wavelength of different colours, there won't be a rainbow.