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An ellipse has OB as semi minor axis, $F$ and $F'$ its foci and th angle $FBF'$ is a right angle. Then the eccentricity of the ellipse is :


( A ) $\frac{1}{\sqrt{2}}$
( B ) $\frac{1}{2}$
( C ) $\frac{1}{\sqrt{3}}$
( D ) $\frac{1}{4}$

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