Surveying
The parallax equation Δp = BmΔh/H - h is applicable to entire overlap of the photographs only if parallax is measured

Normal to base line
Neither (A) nor (B)
Both (A) and (B)
Parallel to base line

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

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