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# An ellipse has OB as semi minor axis, and its focii and the angle FBF’ is a right angle Then the eccentricity of the ellipse is‐

## The correct answer is:

Given,An ellipse has $OB$ as semi-minor axis, $F$ and $F_{_{′}}$ its foci and the $∠FBF_{_{′}}$ is a right angle,we need to find the eccentricity of the ellipse is

Therefore, the eccentricity of the ellipse is

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