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

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

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Surveying
Pick up the correct statement for horizontal photographs.

The two sides of a road meet at the vanishing point
The lines parallel to the negative plane are projected as parallel lines
Parallel lines do not appear parallel in central projection
All listed here

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