Q. The sum of the focal distances of any point on the conic $\frac{x^{2}}{25} + \frac{y^{2}}{16} = 1$ is
A) 10
B) 9
C) 41
D) 18
Explanation
(a)
We know , if $P\$is any point on the curve, then sum of focal distances$=$length of major axis$\$
$= SP + S^{'}P = 2a = 2(5) = 10$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.