Surveying
The point on the photograph where bisector between the vertical line through optical centre of the camera lens and the plate perpendicular meets, is known as

Perspective centre
Plumb point
Isocenter
Principal point

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

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
None of these
index error i.e. error due to imperfect adjustment of the vertical circle vernier

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