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A planet moves around the sun. At a given point \( P \), it is closest from the sun at a distance \( d_{1} \) and has a speed \( v_{1} \). At another point \( Q \), when it is farthest from the sun at a distance \( d_{2} \), its speed will be [MP PMT 1987; DCE 2002]
(a) \( \frac{d_{1}^{2} v_{1}}{d_{2}^{2}} \)
(b) \( \frac{d_{2} v_{1}}{d_{1}} \)
(c) \( \frac{d_{1} v_{1}}{d_{2}} \)
(d) \( \frac{d_{2}^{2} v_{1}}{d_{1}^{2}} \)
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