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

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Surveying
Dumpy level is most suitable when

fly levelling is being done over long distance
the instrument is to be shifted frequently
many readings are to be taken from a single setting of the instrument
All of these

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