Surveying
If the staff is not held vertical at a level¬ling station, the reduced level calculated from the observation would be

None of these
less than true R.L.
true R.L.
more than true R.L.

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Surveying
Homologous points are

Plumb points of stereo pair of photographs
Corresponding points on the ground and photograph
Opposite corners of a photograph
Nodal points of the camera lens

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