Tony Moss wrote: > Bob Haselby contributed > > >This sounds like a "signal mirror" which were also contained in life > >jackets etc as survival gear. The more modern are quite effective > >and are great for annoying people on the beach. It uses double internal > >reflection in the hole to give a virtual image of the sun > > Any chance of a diagram or somesuch to show how this works Bob? - I > understand 'total internal reflection' but 'double internal reflection" > err! yes!! err!! I should have paid more attention in Physics instead > of yearning for the workshop! > > Tony Moss
Tony, I found a couple of web sites on signal mirrors. http://www.equipped.com/signal.htm#ReflectionsOfLight describes how they work and how to use them. I also made a sketch of how I think it works. The attached bit map file shows this. If you have any trouble viewing this let me know. Bob
