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

  1. 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 :)
     
  2. jcsd
  3. HallsofIvy

    HallsofIvy 40,967
    Staff Emeritus
    Science Advisor

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

    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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