Physics-
General
Easy

Question

A convex lens has a focal length f. It is cut into two parts along the dotted line as shown in the figure. The focal length of each part will be

  1. fraction numerator f over denominator 2 end fraction    
  2. f    
  3. fraction numerator 3 over denominator 2 end fraction f    
  4. 2 f    

The correct answer is: 2 f


    f equals fraction numerator R over denominator 2 left parenthesis mu minus 1 right parenthesis end fraction, f to the power of ´ end exponent equals fraction numerator R over denominator left parenthesis mu minus 1 right parenthesis end fraction Þ f to the power of ´ end exponent equals 2 f

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