Surveying
After fixing the plane table to the tripod, the main operations which are needed at each plane table station are (i) Levelling (ii) Orientation (iii) CenteringThe correct sequence of these operations is

(ii), (iii), (i)
(i), (ii), (iii)
(i), (iii), (ii)
(iii), (i), (ii)

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Surveying
Homologous points are

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

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