[![](https://i.stack.imgur.com/8JERy.jpg)](https://i.stack.imgur.com/8JERy.jpg)

The primed reference frame is moving relative to the unprimed frame. So if we were to take the lorentz transformation of point P from the unprimed to primed, would it be the point A or B that it returns ? Assuming that the Lorentz transformation is passive i.e. we are talking about the same event in two frames, my first guess was B, because only at B will the primed reference frame see P to occur. A on the other hand is what the unprimed reference frame sees when P occurs. Is this true ?

*PA is parallel to the x axis and PB is parallel to the x' axis.*