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About plano-convex lens

  1. Apr 24, 2016 #1
    1. The problem statement, all variables and given/known dataλ
    擷取.PNG 擷取2.PNG
    2. Relevant equations
    2t=mλ for dark fingers

    3. The attempt at a solution
    how can i calculate r5001 dark,also ,what is the meaning of r in qusetion(r=5mm),<----- it is not the curvature R of plano-convex lens also it is not r5001 dark,since it will get incorrect answer so what is radius r mean?
  2. jcsd
  3. Apr 24, 2016 #2
    Last edited: Apr 24, 2016
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