A solar furnace can be used to cook food in sunny places where it is difficult to obtain other fuels. It works by reflecting and focussing the Sun's heat. What would be the best shape and material for a solar furnace?

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A solar furnace can be used to cook food in sunny places where it is difficult to obtain other fuels. It works by reflecting and focussing the Sun's heat. What would be the best shape and material for a solar furnace?