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Optics - Thin Lens Formula

  1. Jan 17, 2008 #1
    Hi I need help on figuring where and how 1/f = 1/do + 1/di
    My teacher told me it relates to the ray diagram but i have no clue where to start to find where this formula has come from. Any help would be much appreciated.
  2. jcsd
  3. Jan 17, 2008 #2


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    Here shows you how to derive it.
  4. Jan 17, 2008 #3
    WOW thank you so much... i cant even explain how happy uve made me. I know this will help for sure but could you explain about how equation 1 relates to the triangles to me plz. Just make it a lil more clearer to me:D or could someone explain to me how
    di/f -1 is related to
    Ab/cd = Af/df like i see the labels on the diagram but it doesnt make sense like why we divide f and stuff sry if u guys cant understand what im trying to say
    Last edited: Jan 17, 2008
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