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A convex lens forms an image three times the size of the object on a screen. If the distance between the screen and the object is 120cm. Determine;

  1. The object distance.    
  2. The focal length of the lens. 

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  1. v/μ=3
      v=3μ
    μ+ v =120cm
    μ+3μ=120cm
        4μ=30cm   
  2. f= μv   =  2i =  3 × 30 × 30  =22.5cm
       μ+v      μ+v          120
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