Sorry for the different topic, but this reminds me that - when I was younger - I was wondering what would happen if you put two parabolic mirrors, of different sizes, one in front of the other with their respective focal points just at the same place.
Here I draw half of the two mirrors and a sunbeam.
The parallel sunbeams should all concentrate on this point without possibility to escape...
I was convinced that I could never try and I forgot the idea.
Now, what do you think? Is it feasible?
Last edited: Sep 17, 2010