1.

If OB is the semi-minor axis of an ellipse , F_1 and F_2 are its foci and the angle between F_1B and F_2Bis a right angle , then the square of the eccentricity of the ellipse is

Answer»

`(1)/(2) `
` ( 1)/(SQRT2) `
`( 1)/(2sqrt2) `
`( 1)/(4)`

ANSWER :A


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