If the dip circle is set at $45^o$ to the magnetic meridian, then the apparent dip is $30^o$. The true dip. of the place is

  • A

    ${\tan ^{ - 1}}\,\left( {\frac{1}{{\sqrt 3 }}} \right)$

  • B

    ${\tan ^{ - 1}}\,\left( {\frac{1}{{\sqrt 6 }}} \right)$

  • C

    ${\tan ^{ - 1}}\,\left( {\frac{2}{{\sqrt 3 }}} \right)$

  • D

    ${\tan ^{ - 1}}\,\left( {\frac{{\sqrt 3 }}{2}} \right)$

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