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

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

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Surveying
A telescope is said to be inverted if its

vertical circle is to its right and the bubble of the telescope is down
vertical circle is to its right and the bubble of the telescope is up
vertical circle is to its left and the bubble of the telescope is up
vertical circle is to its left and the bubble of the telescope is down

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