Surveying
If ‘f’ is the focal length of the camera lens and ‘θ’ is the angle of tilt, the distance of the plumb point from the principal point will be

f tan θ
f sin θ
f sec θ
f cos θ

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Surveying
Pick up the correct statement for horizontal photographs.

All listed here
The two sides of a road meet at the vanishing point
The lines parallel to the negative plane are projected as parallel lines
Parallel lines do not appear parallel in central projection

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