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Question

A fixed cylindrical tank of height H=4 m and area A, is filled up with a liquid. An observer through a telescope fitted at the top of the wall of the tank and inclined at theta equals 45 to the power of ring operator end exponent with the vertical. When the tank is completely filled with liquid, he notices an insect, which is at the centre of the bottom of the tank. At t=0, he opens a cork of area a at the bottom of the tank. The insect moves in such a way that it is visible for a certain time. Find the refractive indexof the liquid

  1. fraction numerator 5 over denominator 3 square root of 2 end fraction    
  2. fraction numerator 5 over denominator square root of 2 end fraction    
  3. fraction numerator 3 over denominator 5 square root of 2 end fraction    
  4. fraction numerator 1 over denominator 10 square root of 2 end fraction    

The correct answer is: fraction numerator 5 over denominator 3 square root of 2 end fraction

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