A spherical balloon of radius \( r \) subtends an angle \( \theta \...

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A spherical balloon of radius \( r \) subtends an angle \( \theta \) at the eye of the observer. If the angle of elevation of its centre is
(W) \( \phi \), then the height of the centre of balloon is
(a) \( r \sin \phi / 2 \cos \theta \)
(b) \( r \sin \phi \operatorname{cosec} \theta \)
(c) \( r \sin \phi \operatorname{cosec} \theta / 2 \)
(d) None of these
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