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The largest and the shortest distance of the earth from the sun are \( r_{1} \) and \( r_{2} \), its distance from the sun when it is at the perpendicular to the major axis of the orbit drawn from the sun
[CBSE PMT 1991]
(a) \( \frac{r_{1}+r_{2}}{4} \)
(b) \( \frac{r_{1} r_{2}}{r_{1}+r_{2}} \)
(c) \( \frac{2 r_{1} r_{2}}{r_{1}+r_{2}} \)
(d) \( \frac{r_{1}+r_{2}}{3} \)
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