Which of the following is/are correct?
1
Isocentre is the point at which the tilted axis of the camera meets the vertical photograph.
2
Isocentre is the point at which the bisector of tilt meets the vertical photograph.
3
Nadir point is the point where the plumb line dropped from the front nodal point meets the plane of photographs.
4
The exposure station is the point in space occupied by the camera lens at the instant of exposure.