Surveying
The point where vertical line passing through the perspective centre intersects the plane of the photograph, is known as

Plumb point
Isocenter
Photo plumb point
Nadir point

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Surveying
For a line AB

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

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