Q. If $t_{1\ }and\ t_{2}$ be the parameters of the end points of a focal chord for the parabola $y^{2\ } = 4ax,$ then which one is true?
A) $t_{1}t_{2} = 1$
B) $\frac{t_{1}}{t_{2}} = 1$
C) $t_{1}t_{2}\ = \ - 1$
D) $t_{1} + t_{2}\ = - 1$
Explanation
(c)
It is a known result
$t_{1}t_{2} = - 1$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.