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Question

A double convex lens, lens made of a material of refractive index mu subscript 1 end subscript, is placed inside two liquids or refractive indices mu subscript 2 end subscript and mu subscript 3 end subscript, as shown. mu subscript 2 end subscript greater than mu subscript 1 end subscript greater than mu subscript 3 end subscript. A wide, parallel beam of light is incident on the lens from the left. The lens will give rise to

  1. A single convergent beam    
  2. Two different convergent beams    
  3. Two different divergent beams    
  4. A convergent and a divergent beam    

The correct answer is: A convergent and a divergent beam


    As mu subscript 2 end subscript greater than mu subscript 1 end subscript comma the upper half of the lens will become diverging.
    As mu subscript 1 end subscript greater than mu subscript 3 end subscript comma the lower half of the lens will become converging

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