The values of the apparent angles of dip in two planes at right angles to each other are $45^{\circ}$ and $30^{\circ}$ respectively. The true value of angle of dip at the place is ............
The values of the apparent angles of dip in two planes at right angles to each other are $45^{\circ}$ and $30^{\circ}$ respectively. The true value of angle of dip at the place is ............
- A
$\cot ^{-1}(1)$
- B
$\cot ^{-1}(2)$
- C
$\cot ^{-1}(3)$
- D
$\cot ^{-1}(4)$
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