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1. $\frac{x^{2}}{a^{2}} + \frac{y^{2}}{b^{2}} = 1$

Answer: Option C

Explanation:

প্রশ্নমতে, \frac{2 b^{2}}{a} = \frac{1}{2} ×2a ⇒ \frac{b^{2}}{a^{2}} = \frac{1}{2} ∴e= \sqrt{1- \frac{b^{2}}{a^{2}}} = \sqrt{1 - \frac{1}{2}} = \frac{1}{\sqrt{2}}

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