This is a statent that I've read under the topic of parabola :
"The parabola has 2 real focii situated on its axis, one of which is at infinity, where the corresponding directrix is also at infinity"
Here's where I don't understand,how can the the other focii be called as real when the coordinates is obviously at infinity ?
Is this concept inaccurate or my concept is ? Please clarify if you can.