Question

If $(2,0)$ is vertex and $y-$axis is the directrix of a parabola. Then the length of its latus rectum is

• A. $2$
• B. $4$
• C. $8$
• D. $16$

Answer 1

The correct option is C $8$

Since the directrix is $x=0$ and vertex is $(2,0)$ focus will be on $x-$axis
Since the distance between directrix and vertex is $2$.
Length of its latus rectum
$=4\times$distance between directrix and vertex
$=4\times 2=8$