An ellipse has `O B` as the semi-minor axis, `Fa n dF '` as its foci, and `/_F B F '` a right angle. Then, find the eccentricity of the ellipse.

An ellipse has O B as the semi-minor axis, F and F ' as its foci, and /_F B F ' a right angle. Then, find the eccentricity of the ellipse.

An ellipse has O B as the semi-minor axis, F and F ' as its foci, and /_F B F ' a right angle. Then, find the eccentricity of the ellipse.

An ellipse has OB as the semi-minor axis,F and F' as its foci,and /_FBF' a right angle.Then,find the eccentricity of the ellipse.

An ellipse has O B as semi minor axis, F and F^(prime) its foci and the angle F B F^(prime) is a right angle. Then the eccentricity of the ellipse is

An ellipse has OB as a semi-minor axis, F and F' are its two foci and the angle FBF' is a right angle. Find the eccentricity of the ellipse.

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 semiminor axis, F and F^' its focii and the angle FBF^(') is a right angle. Then the eccentricity of the ellipse is