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When sunlight passes through a Fresnel lens, it is concentrated onto a tiny point, dramatically increasing its energy density. The sun delivers about 1,000 watts of energy per square meter at Earth's surface, but the lens collects light from a large area and squeezes it into a pinpoint. This focused beam raises temperatures high enough to melt metals, ignite objects, and even crack stone by thermal stress. The phenomenon is not magic but pure physics-concentrated solar radiation generates intens
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