Question

What is the length of the smallest focal chord of the parabola $y^2=4ax?$

• A. a
• B. 2 a
• C. 4 a
• D. 8 a

Answer 1

Answer: (C)

The length of smallest focal chord of the parabola is its latus rectum and for parabola $y^2=4ax$, it is $4a$.