If the angle between the lines joining the end points of minor axis of an ellipse with its foci is $\pi\over2$, then the eccentricity of the ellipse is
If the angle between the lines joining the end points of minor axis of an ellipse with its foci is $\pi\over2$, then the eccentricity of the ellipse is
- [IIT 1997]
- A
$1\over2$
- B
$1/\sqrt 2 $
- C
$\sqrt 3 /2$
- D
$1/2\sqrt 2 $
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