Physics-
General
Easy

Question

Find the variation of refractive index assuming it to be a function of y such that a ray entering origin at grazing incidence follows a parabolic path y = x2 as shown in fig

  1. square root of 1 plus 4 x to the power of 2 end exponent end root    
  2. square root of 1 plus 2 x to the power of 2 end exponent end root    
  3. square root of 1 plus x to the power of 2 end exponent end root    
  4. square root of 1 plus 8 x to the power of 2 end exponent end root    

The correct answer is: square root of 1 plus 2 x to the power of 2 end exponent end root

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