An ellipse has \( O B \) as semi minor axis, \( F \) and \( F^{\prime} \) its foci and the angle....

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An ellipse has \( O B \) as semi minor axis, \( F \) and \( F^{\prime} \) its
\( \mathrm{P} \)
foci and the angle \( F B F^{\prime} \) is a right angle. Then the
W.
eccentricity of the ellipse is
(1) \( \frac{1}{\sqrt{2}} \)
(2) \( \frac{1}{2} \)
(3) \( \frac{1}{4} \)
(4) \( \frac{1}{\sqrt{3}} \)
.
(4)(8)(8)


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