1. Oct 29, 2011 #1

   greg_k92

   

   1. The problem statement, all variables and given/known data
   A person can focus objects clearly only between 15 cm and 40 cm. What eyeglasses would you prescribe
   
   
   2. Relevant equations
   1/p+1/q=1/f
   P=1/f
   
   
   3. The attempt at a solution
   I don't really know what to use for p, or f

    

   greg_k92, Oct 29, 2011
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3. Oct 30, 2011 #2

   rude man

   

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   Gold Member

   Did they teach you about the eye?
   q = distance from eye lens to retina
   p = distance from object viewed to eye lens
   
   Now think - you want the person to see things at p = infinity but you also want them to focus as close-in as possible, given their innate limitation (uncorrected, p = 15cm to p = 40 cm).

    

   rude man, Oct 30, 2011

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