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

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

(b)${\mathrm{tan}}^{-1}\left(2\right)$

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

(d)None of these