There is a circular tube in a vertical plane. Two liquids which do not mix and of densities $d_1$ and $d_2$ are filled in the tube. Each liquid subtends $90^{\circ}$ angle at centre. Radius joining their interface makes an angle $\alpha$ with vertical. ratio $d_1/d_2$ is <br>

Question

( A ) $\frac{1 + \tan \alpha}{1 - \tan \alpha}$
( B ) $\frac{1 + \sin \alpha}{1 - \cos \alpha}$
( C ) $\frac{1 + \cos \alpha}{1 - \cos \alpha}$
( D ) $\frac{1 + \sin \alpha}{1 - \sin \alpha}$