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Concave mirror is the best suited because it converges the light rays and tht converging creates heat and helps in cooking food.....
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The concave mirror is used in solar cooker because it reflect the sun rays and focus them at a point where the heat produces a lot and cooks the food that placed at that point.
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It is Concave Mirror because it converges the sunlight to a single point...So more heat...Food gets cooked faster...