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

An ellipse has OB as semi minor axis, F and F? its foci and the angle

1.	An ellipse has OB as semi minor axis, F and F? its foci and the angle FBF? is a right angle. Then the eccentricity of the ellipse is
A.	\[\frac{1}{\sqrt{2}}\]
B.	\[\frac{1}{2}\]
C.	\[\frac{1}{4}\]
D.	\[\frac{1}{\sqrt{3}}\]
Answer» B. \[\frac{1}{2}\]

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

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