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Question

Two planoconvex lenses each of focal length 10 cm & refractive index 3/2 are placed as shown. In the space left, water (R.I = 4/3) is filled. The whole arrangement is in air. The optical power of the system is (in diopters) :

  1. 6.67    
  2. – 6.67    
  3. 33.3    
  4. 20    

The correct answer is: 6.67

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