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This concave mirror is made from expanded polystyrene and this reflective film at a cost of 25 cents per square meter, and it is several hundred times cheaper than these mirrors which focus solar radiation to convert it into heat and electricity, and such a radical reduction in the cost of similar mirrors makes their electricity cheaper than from solar panels, or thermal and nuclear power plants. I have already made many mirrors from expanded polystyrene for this solar station which provided space heating of this house in the winter and heated the water of this pool in the summer during 8 years. But my solar station used similar polystyrene mirrors which formed a concave trough, while this video will show the solution to a more difficult problem when such a reflective film should form not a trough, but a dish. Now I am showing another blogger’s attempt to solve this problem, although we see that he used polyurethane foam instead of the polystyrene. This is his mirror, and we understand that maki
