A shell fired from the base of a mountain just clears it. If $\alpha$ is the angle of projection then the angular elevation of the summit $\beta$ is
A shell fired from the base of a mountain just clears it. If $\alpha$ is the angle of projection then the angular elevation of the summit $\beta$ is
- A
$\frac{1}{2} \alpha$
- B
$tan^{-1}(1/2)$
- C
$tan^{-1}(1/2 \,\,tan \,\, \alpha )$
- D
$tan^{-1}(2 \,\,tan\,\, \alpha )$
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