Question

The length of the latus rectum of the parabola which has focus at $(-1,1)$ and the directrix is $4x+3y-24=0$ is

• A. 4
• B. 6
• C. 8
• D. 10

Answer 1

Answer: (D)

Length of latus rectum $=2\times$ distance of focus from directrix
$=2\times \frac{1-4+3-24}{5}=10$