FRESNEL LENS 1 SUN COLLECTOR

Fresnel lens blocks out certain portions(zones) of a light wave that would be out of phase with other parts and cause destructive interference and therefore lower the intensity. When you block those parts out with a fresnel lens you are left with a bunch of in phase light waves which constructively interfere to make a very powerful beam. Awesome stuff. Look it up on wiki.

You can also use the same principle to amplify sound. The zones would be much larger though.

Why does the lense itself not burn?

It concentrates light, as the light passes through the lens, it is like a glass window.

7:00 That's cool art! :D

how thick is the lens and how much does it cost?

wow...

Dynamite with a LazerBeam!!!

guaranteed to blow your mind ANYTIE-IME

the light would not be the cause of the glass melting, it is the heat the light generates.