Physics-
General
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Question

A vessel contains a slab of glass 8cm thick and of refractive index 1.6 over the slab, the vessel is filled by oil of refractive index mu upto height 4.5 cm and also by another liquid i.e., water of refractive index fraction numerator 4 over denominator 3 end fraction and height 6cm as shown in figure. An observer looking down from above, observes that, a mark at the bottom of the glass slab appears to be raised up to position 6cm from the bottom of the slab. The refractive index of the oil is

  1. 1.5    
  2. 2.5    
  3. 0.5    
  4. 1.2    

The correct answer is: 1.5

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