Physics-
General
Easy

Question

For the biprism experiment shown in the figure, the fringe width increases when

  1. biprism is moved towards the slit    
  2. entire apparatus is submerged in a liquid having R.I. less than that of prism    
  3. a biprism having smaller angle a is used    
  4. the slit width is reduced    

The correct answer is: biprism is moved towards the slit

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