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The distance between the directrix is eq...

The distance between the directrix is equal to 8 times the distance between the foci then e =

A

`1/2`

B

`(1)/(2sqrt(2))`

C

`1/4`

D

`1/8`

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The correct Answer is:
B
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AAKASH SERIES-ELLIPSE-PRACTICE EXERCISE
  1. If the latusrectum of an ellipse is half of its major axis then e is

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  2. If the latus rectum of an ellipse is half of its minor axis then e =

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  3. The distance between the directrix is equal to 8 times the distance be...

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  4. If the m inor axis of an ellipse form s an equilateral triangle with o...

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  5. Let S, S^(') are the focii and BB^(') be the minor axis of an ellipse....

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  6. The length of the latus rectum of an ellipse is 4. The focus and its c...

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  7. Let P be a point on an ellipse whose parameter is (pi)/(3) . The sum a...

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  8. The latus rectum LL^(') subtends a right angle at the centre of the el...

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  9. If the latus rectum of a hyperola forms an equilateral triangle with t...

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  10. Area of the quadrilateral formed by the extremities of major axis and ...

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  11. If x+ky-5=0 is a tangent to the ellipse 4x^(2)+9y^(2)=20 then k =

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  12. The equations of the tangents to the ellipse 3x^(2)+4y^(2)=12 which ar...

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  13. The point of contact 4x-5y+25=0 with the ellipse 9x^(2)+25y^(2)=225 is

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  14. The number of tangents to (x^(2))/(25)+(y^(2))/(9)=1 through (1,1) is

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  15. The product of the slopes of the tangents to the ellipse 2x^(2)+3y^(2)...

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  16. The radius of the director circle of 16x^(2)+9y^(2)=144 is

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  17. The quadratic equation whose one root is (3+sqrt(5))/(2-sqrt(5)) is

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  18. The equation to the auxiliary circle of (x^(2))/(12)+(y^(2))/(18)=1 is

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  19. The equation of the normal to the ellipse x^(2)/4+y^(2)/1=1 at (2, -1)...

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  20. The equations of the tangents drawn from (2, 3) to the ellipse 9x^(2) ...

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