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Essa rocha NÃO deveria começar a brilhar desse jeito apenas com luz solar. Mas uma lente convergente do tipo Fresnel consegue concentrar uma enorme quantidade de energia em um ponto minúsculo. E é aí que a Física fica impressionante. A radiação solar chega espalhada pela superfície da lente. Quando os raios convergem para o ponto focal, a densidade de energia aumenta drasticamente e a temperatura local pode ultrapassar mais de 1000 °C em poucos segundos. Nesse nível de aquecimento, minerais p
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