Surveying
Homologous points are

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

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Surveying
Which of the following errors cannot be eliminated by taking both face observations ?

index error i.e. error due to imperfect adjustment of the vertical circle vernier
None of these
error due to non-parallelism of the axis of telescope level and line of collimation
error due to horizontal axis not being perpendicular to the vertical axis

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