Question

For the parabola $y^2=8x$, the length of the latus-rectum is

• A. 4
• B. 2
• C. 8
• D. None of these

Answer 1

Answer: (C)

$y^2=8x\Rightarrow y^2=4.2x\Rightarrow a=2$
Length of the latus-rectum $=4a=8$