Q. If $t_{1}$ and $t_{2}$ be the parameters of the end points of a focal chord for the parabola $y^{2} = 4 a x,$ then which one is true ?

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A

$t_{1} t_{2} = 1$

14%

B

$\frac{t _{1}}{t _{2}}$ = 1

9%

C

$t_{1} t_{2} = - 1$

68%

D

$t_{1} + t_{2} = - 1$

9%

Solution:

$t_{1} t_{2} = - 1$