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Question:

How does a mirror reflecting the sun generate heat if focused on a small spot?

Say a curved 2m Square mirror board is reflected and focused to a 0.01 Square meter area, does the temperature (t) = 200t?

Answer:

The energy density of the sunlight hitting is 200X higher but that does NOT mean the temperature is 200X higher. There is a solar power electrical generator that uses a lot of mirrors to focus sunlight on a heat exchanger that is cooled with water (a solar powered water heater), the water heats up, boils, and the steam turns a turbine.

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