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

  • Thread starter eep
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  • #1
eep
227
0
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.
 

Answers and Replies

  • #2
gnpatterson
69
0
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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