Posted on 29 October 2011 at 17:00h

Last night I went to see Jean Michel Jarre in concert. He is a Frenchman (which explains the name) who was very big on the electronic music scene in the 70's. My children call it Dad's techno. He once did a concert projecting images onto the pyramids and although there are no pyramids in Bergen I was expecting a good light show. The first time I saw lasers being used in a concert was at a Genesis concert in the 1976. Technology has come a long way since then so I was expecting huge advances and was a little disappointed that the light cone is still pretty much it. The biggest difference is that the lasers are multicoloured. This is a bit strange since according to HL physics lasers are monochromatic so how does a laser change colour? It seems that it's the same way as pixels on a computer screen change colour, by mixing three different lasers, red, green and blue any colour can be created. The cone is made by rotating an angled mirror in front of the beam.