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General
Easy

Question

Two point sources P and Q are 24 cm apart. Where should a convex lens of focal length 9 cm be placed in between them so that the images of both sources are formed at the same place?

  1. 3 cm from P    
  2. 15 cm from Q    
  3. 9 cm from Q    
  4. 18 cm from P    

The correct answer is: 18 cm from P

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