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

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SUMMARY

The discussion centers on determining the size of a glass lens required to focus light to achieve a temperature of 1000 Celsius. It highlights the misconception that a specific amount of energy directly correlates to a specific temperature. The conversation also touches on the potential for using materials with a higher refractive index to reduce lens size and mentions Fresnel lenses as a relevant technology. Participants emphasize the importance of understanding energy concentration rather than simply focusing on temperature.

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  • Understanding of optics and lens design
  • Knowledge of thermal energy and temperature concepts
  • Familiarity with refractive index and its implications in lens materials
  • Basic principles of energy concentration and heat transfer
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  • Research the properties and applications of Fresnel lenses
  • Explore the relationship between energy concentration and temperature in optics
  • Investigate materials with high refractive indices for lens manufacturing
  • Learn about the calculations involved in lens size determination for thermal applications
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Physicists, optical engineers, and anyone interested in the principles of lens design and thermal energy concentration.

Panthera Leo
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How big should a lens be to focus enough light to reach 1000 celsius?

I was wondering how big should a glass lens be to focus enough light to produce a temperature of about 1000 celsius 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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