Let $S$ be the focus of the parabola $y^2=4 a x$ and $\mathrm{PQ}$ be a focal chord such that…

Let $S$ be the focus of the parabola $y^2=4 a x$ and $\mathrm{PQ}$ be a focal chord such that $\mathrm{SP}=\alpha$ and $\mathrm{SQ}=\alpha^{\prime}$. Then $\frac{1}{\alpha}+\frac{1}{\alpha^{\prime}}=$
  1. $a$
  2. $a^2$
  3. $\frac{1}{a}$
  4. $\frac{1}{a^2}$

Solution

No solution. Refer to answer key.

Asked in: AP EAMCET 2017 (24 Apr Shift 1)

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