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What kind of mirror- concave, convex, or...

What kind of mirror- concave, convex, or plain- would be best suited for use in a solar cooker? Why?

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A solar cooker uses heat of the sunlight to cook and heat food. A mirror is used to reflect and focus sunlight at a point. A concave mirror is used in a solar cooker for this purpose. The mirror focuses all the incident sunlight at its focus. The temperature at that point increases, thereby cooking and heacing the tood placed at that point.
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