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

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

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Surveying
Normal tension is that pull which

makes the correction due to pull equal to zero
makes the correction due to sag equal to zero
neutralizes the effect due to pull and sag
is used at the time of standardising the tape

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