Surveying
The correction applied to the measured base of length ‘L’ is

All of these
Slope = (h²/2L) + (h⁴/8L³) where h is height difference of end supports
Sag = L³w²/24P² where w is the weight of tape/m
Tension = (P - Ps)L/AE

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Surveying
A ’level line’ is a

line parallel to the mean spheriodal surface of earth
line passing through the objective lens and the eye-piece of a dumpy or tilting level
line passing through the center of cross hairs and the center of eye piece
horizontal line

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