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Ellipse question

2008 · Shift 0 · Q45

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PYQ Library
JEE Main
Mathematics
Ellipse
2008 · Shift 0 · Q45

Ellipse question

2008 · Shift 0 · Q45

JEE MainMathematicsEllipseMCQ+4 / −1

A focus of an ellipse is at the origin. The directrix is the line

x=4

and the eccentricity is

{{1 \over 2}}

. Then the length of the semi-major axis is :

A
${{8 \over 3}}$
B
${{2 \over 3}}$
C
${{4 \over 3}}$
D
${{5 \over 3}}$

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