At present a large number of mirrors are placed around the receiver and concentrate all of them on the receiver.why can't we use convex lens to concentrate sunlight
1. From a practical point of view, manufacturing a convex lens with surface smoothness precision about from order of light wavelength, (400-700nm), is more EXPENSIVE and Time-Consuming.
2. Convex lenses compared to mirrors are very heavy and need high-priced and huge stabilization bases.