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JEE Main & Advanced Mathematics Conic Sections Question Bank Parabola

  • question_answer
    If the vertex of a parabola be at origin and directrix be \[x+5=0\], then its latus rectum is               [RPET 1991]

    A)            5     

    B)            10

    C)            20   

    D)            40

    Correct Answer: C

    Solution :

               \[S\equiv (5,\,0)\]. Therefore, latus rectum \[=4a=20\].


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