Physics-
General
Easy

Question

An object is placed at a point distant x from the focus of a convex lens and its image is formed at I as shown in the figure. The distances x, x' satisfy the relation

  1. fraction numerator x plus x ' over denominator 2 end fraction equals f2=f'/>    
  2. f equals x x ''/>    
  3. x plus x ' less or equal than 2 f2f'/>    
  4. x plus s x ' greater or equal than 2 f2f'/>    

The correct answer is: x plus s x ´ greater or equal than 2 f

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