Its called [Concentrator photovoltaics](https://en.wikipedia.org/wiki/Concentrator_photovoltaics)(concentrated solar power is a term reserved for solar thermal power plants)
It solves specific problems but isn’t great. If you capture light from 10 m^2 with your magnifying glass and concentrate it down into 1 m^2 then you can use a single expensive 1 m^2 solar panel(or multiple tiny ones) with higher efficiency(~40%) to get more energy out of the limited light you captured
But you still had to capture 10 m^2 of light so you probably could have put out 10 m^2 of wayyy cheaper solar panels(20% efficiency) and gotten less power for significantly less cost.
For the most part land is relatively cheap if you’re not picky about where it is so a whole bunch of cheap solar panels are often the choice but if you really need to extract the most power out of a given area and don’t want to spend a fortune on big multijunction panels then you can use lenses to focus the sun down on to lots of little ones
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