The length of the latus rectum of a parabola, whose vertex and focus are on the positive X…

Question

The length of the latus rectum of a parabola, whose vertex and focus are on the positive $X$-axis at distances $R$ and $S$ ($>R$) respectively from the origin, is

Accepted Answer

Distance between vertex and focus is $S-R=a$; latus rectum $=4a=4(S-R)$.

Solutions · 1