JEE Math Practice Question
An ellipse has $$OB$$ as semi minor axis, $$F$$ and $$F$$' its focii and theangle $$FBF$$' is a right angle. Then the eccentricity of the ellipse is :
- A.$${1 \over {\sqrt 2 }}$$
- B.$${1 \over 2}$$
- C.$${1 \over 4}$$
- D.$${1 \over {\sqrt 3 }}$$
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