Surveying
The displacement of the pictured position of a point of h elevation on a vertical photograph taken with a camera of 30 cm focal length, from an altitude of 3000 m, is

7.5 mm
5.5 mm
6.5 mm
4.4 mm

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Surveying
Normal tension is that pull which

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

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