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Question

In a Young’s double slit experimental arrangement shown here, if a mica sheet of thickness t and refractive index mu is placed in front of the slit S subscript 1 end subscript comma then the path difference left parenthesis S subscript 1 end subscript P minus S subscript 2 end subscript P right parenthesis

  1. Decreases by left parenthesis mu minus 1 right parenthesis t    
  2. Increases by left parenthesis mu minus 1 right parenthesis t    
  3. Does not change    
  4. Increases by mu t    

The correct answer is: Increases by left parenthesis mu minus 1 right parenthesis t


    Path difference at P capital delta equals left parenthesis S subscript 1 end subscript P plus left parenthesis mu minus 1 right parenthesis t right parenthesis minus S subscript 2 end subscript P
    equals left parenthesis S subscript 1 end subscript P minus S subscript 2 end subscript P right parenthesis plus left parenthesis mu minus 1 right parenthesis t

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