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    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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