The true value of angle of dip at a place is $60^o$, the apparent dip in a plane inclined at an angle of $30^o$ with magnetic meridian is

  • A

    ${\tan ^{ - 1}}\frac{1}{2}$

  • B

    ${\tan ^{ - 1}}(2)$

  • C

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

  • D

    None of these

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