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並前往https://www.quora.com/Can-you-start-a-fire-with-one-plane-mirror-reflecting-sunlight-If-so-what-is-the-underlying-physics

Can you start a fire with one plane mirror reflecting sunlight? If ...

Not with one flat mirror, but with many flat mirrors the heat can be multiplied and concentrated by making a single focal point. Please see “solar power tower”.

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