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 [AIEEE 2005]

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 [AIEEE 2005]
A.	\[\frac{1}{4}\]
B.	\[\frac{1}{\sqrt{3}}\]
C.	\[\frac{1}{\sqrt{2}}\]
D.	\[\frac{1}{2}\]
Answer» D. \[\frac{1}{2}\]

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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 [AIEEE 2005]

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