If θ1 and θ2 be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip θ is given by 

(a) cot2θ=cot2θ1+cot2θ2

(b) tan2θ=tan2θ1-tan2θ2

(c) cot2θ=cot2θ1-tan2θ2

(d) tan2θ=tan2θ1-tan2θ2

Concept Videos :-

#10 | Earth's Magnetism
#11 | Apparent & True Dip
#12 | Neutral points
#13 | Comparison of Magnetic Field of Earth at Two Points
#14 | Variation of Earth's Magnetic Field

Concept Questions :-

Earth's magnetism
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