1.

B-t. Find the eccentricity of an ellipse of which distance between the foci is 10 and that of focus andcorresponding directrix is 15.

Answer»

Given 2ae = 10, this implies ae = 5

and a/e = 15

Dividing one over the other,

e^2 = 1/3

Therefore the eccentricity of the ellipse 'e' = 1/√ 3

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answer e=1/2



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