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The minimum distance between an object and it's real image

  1. Sep 21, 2005 #1

    eep

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    Maybe it's just late, but I'm having an extremely difficult time proving that the minimum distance between an object and it's real image (geometric optics, thin lense equation) is 4f. I can see that it is true, however I'm unsure how to go about proving it mathematically.
     
  2. jcsd
  3. Sep 21, 2005 #2
    write an equation for the total distance d1+d2 in term of just d1 then differentiate it wrt d1 find value of d1 for which dif = zero. then find d1+d2
     
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