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:

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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:

Solution: Option (4) is correct.

Note that tan θ = V/H …(1)
where θ is true value of dip . Here we assumed θ=∝
Now, angle of dips, θ1 and θ2 have different formula
tanθ1 = V/(H × cos∝ …(2)
tanθ2 = V/(H× sin∝) …(3)
From eqn (1), (2), (3), we can find value of H/V
which cotθ, which when calculate comes option B

i

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