How big should a lens be to focus enough light to reach 1000 Celcius?

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To achieve a temperature of 1000 Celsius using a lens, the size of the lens depends on various factors, including the material's refractive index and the amount of light focused. A higher refractive index can potentially reduce the lens size needed to reach the desired temperature. However, it is crucial to understand that a specific amount of energy does not directly correlate to a specific temperature, as energy distribution and absorption also play significant roles. The discussion also references Fresnel lenses as a potential solution for focusing light more efficiently. Overall, the relationship between lens size, material properties, and temperature generation is complex and requires careful consideration.
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How big should a lens be to focus enough light to reach 1000 Celcius?

I was wondering how big should a glass lens be to focus enough light to produce a temperature of about 1000 celcius at its foci?

What if the lens was made up of sth with higher refractive index, doesn't this reduce the size of lens?

A rough guess will do... I am just curious

Thanks in advance :)
 
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So we have yet another post (three or four of then today) that seems to assume that a specific amount of energy translates to a specific temperature. That is NOT true.
 

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