why can’t we use lenses to focus solar rays and make electricity ore heat water more efficiently?
In: Engineering
Of course you can although, as another poster mentioned, it might be better to use mirrors to focus rather than lenses. Lenses made of glass are heavy/expensive and plastic ones tend to degrade in the sun after a few months/years.
It really comes down to cost and efficiency. You can search up CSP (concentrated solar power) generators. There are some already constructed although their commercial success is somewhat in doubt.
There are rooftop solar water heaters as well.
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