The slit of a collimator is illuminated by a source as shown in the adjoining figures. The distance between the slit S and the collimating lens L is equal to the focal length of the lens. The correct direction of the emergent beam will be as shown in figure

  1. 1    
  2. 3    
  3. 2    
  4. None of the figures    

The correct answer is: 2

    In case of convex lens if rays are coming from the focus, then the emergent rays after refraction are parallel to principal axis.

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