Surveying
The point where a vertical line through the optical centre of the camera lens intersects the ground, is known as

Perspective centre
Iso-centre
Ground plumb point
Ground principal point

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Surveying
For a line AB

the forebearing of AB and back bearing of BA differ by 180°
the forebearing of AB and back bearing of AB differ by 180°
none is correct
both (A) and (B) are correct

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