Surveying
Assuming human normal vision distance 25 cm, smallest measurable angle 20", and intraocular distance 6.5 cm, the smallest depth to be discerned is

0.5 mm
1.1 mm
0.1 mm
1.00 mm

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Surveying
Normal tension is that pull which

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

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