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The eccentricity of the hyperbola whose ...

The eccentricity of the hyperbola whose length of the latus rectum is equal to 8 and the length of its conjugate axis is equal to half of the distance between its foci, is :

A

`4//sqrt3`

B

`2//sqrt3`

C

`sqrt3`

D

`4//3`

Text Solution

Verified by Experts

The correct Answer is:
B

Given `2b=(1)/(2)(2ae)rArr b = (ae)/(2)`
Now `b^(2)=a^(2)(e^(2)-1)`
`rArr" "a^(2)(e^(2)-1)=(a^(2)e^(2))/(4)rArr3e^(2)=4rArre=(2)/(sqrt3)`
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Knowledge Check

  • The eccentricity of the hyperbola whose length of the latus reetum is equal to 8 and the length of its conjugate axis is equal to half of the distnce between its foci , is :

    A
    `3/4`
    B
    `(4)/(sqrt3)`
    C
    `(2)/(sqrt3)`
    D
    `sqrt3`
  • The eccentricity of an ellipse whose length of latus rectum is equal to distance between its foci, is

    A
    `2 sin 18^@`
    B
    `2 cos 36^@`
    C
    `sin 18^@`
    D
    `cos 36^@`
  • Length of latus rectum is half of minor axis

    A
    `sqrt(3)//2`
    B
    `1//4`
    C
    `1//2`
    D
    none
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