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Question

An object 'O' is kept in air in front of a thin plano convex lens of radius of curvature 10 cm. It's refractive index is 3/2 and the medium towards right of plane surface is water of refractive index 4/3. What should be the distance 'x' of the object so that the rays become parallel finally.

  1. 5 cm    
  2. 10 cm    
  3. 20 cm    
  4. none of these    

The correct answer is: 20 cm

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