This is the most awesome solar-powered project I’ve ever seen in terms of the effects of such a contraption.
These fresnel lens are very practical due to their design.They’re very compact for their light focusing power.
Focusing power, you ask? That’s just my word for this:
You’ll see cement turning red hot, melting glass, and water turning boiling hot in a matter of seconds!!!
They’re available for buying on ebay\amazon. Just search for “fresnel lens”. They’re very cheap.