In an ellipse, if the lines joining focus to the extremities of the minor axis from an equilateral triangle with the minor axis, then the eccentricity of the ellipse is:
Explanation for the correct option:
Finding the eccentricity of the ellipse:
In the given ellipse, , where .
Since, is an equilateral triangle, so .
By squaring both sides we get,
Now,
By squaring both sides we get
Hence, option A is correct.