Physics-
General
Easy

Question

An observer can see through a pin-hole the top end of a thin rod of height h, placed as shown in the figure The beaker height is 3h and its radius h When the beaker is filled with a liquid up to height 2h, he can see the lower end of the rod Then the refractive index of the liquid is

  1. fraction numerator 5 over denominator 2 end fraction    
  2. square root of fraction numerator 5 over denominator 2 end fraction end root    
  3. square root of fraction numerator 3 over denominator 2 end fraction end root    
  4. fraction numerator 3 over denominator 2 end fraction    

The correct answer is: square root of fraction numerator 5 over denominator 2 end fraction end root

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