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 sec θ
f tan θ
f sin θ
f cos θ

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Surveying
Theodolite is an instrument used for

measurement of vertical angles only
measurement of both horizontal and vertical angles
tightening the capstan-headed nuts of level tube
measurement of horizontal angles only

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Surveying
The meridian of a place is

An arc of the great circle which passes through the place and is perpendicular to the equator
A great circle whose plane is perpendicular to the axis of rotation and it also passes through the place
A great circle passing through the place and the poles
A semi-circle which passes through the place and is terminated at the poles

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