Focus–directrix property (parabola) (PS = PM (distance to focus = distance to directrix))
jee-mainjee-advanced
PS = PM (distance to focus = distance to directrix)
What each symbol means
| Symbol | What it stands for |
|---|---|
| M | Foot of perpendicular to directrix |
| P | Point on parabola |
| S | Focus |
When to use this
Definition of parabola as conic e=1.