Recently saw something on instagram that got me into thinking. Can somebody help me understand why? Is it because it is literally the source of light?
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Sometimes. A flame is hot gas, so it is completely transparent. But if it is sprinkled with sooty byproducts of combustion, then it will have a shadow. But even more, when light passes through the different densities of different temperatures of hot gas it will bend away from a straight line and this creates a sort of shadow.
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