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If you have mercury; you have a lens: Put it in a dish and provide a low spin, it will form into a parabolic lens that focuses sunlight. Large lens = hot hot focal point. The dish can actually be j...
Answer
If you have mercury; you have a lens: Put it in a dish and provide a low spin, it will form into a parabolic lens that focuses sunlight. Large lens = hot hot focal point. The dish can actually be j...