Surveying
The point on the photograph where bisector between the vertical line through optical centre of the camera lens and the plate perpendicular meets, is known as

Isocenter
Plumb point
Perspective centre
Principal point

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Surveying
For a line AB

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

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