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A ray of light is incident at the glass-water interface at an angle i it emerges finally parallel to the surface of water, then the value of mg would be

  1. open parentheses fraction numerator 4 over denominator 3 end fraction close parentheses s i n invisible function application i    
  2. fraction numerator 1 over denominator sin invisible function application i end fraction    
  3. fraction numerator 4 over denominator 3 end fraction    
  4. l    

The correct answer is: fraction numerator 1 over denominator sin invisible function application i end fraction

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