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

1.1 mm
0.1 mm
1.00 mm
0.5 mm

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Surveying
Which of the following methods of theodolite traversing is suitable for locating the details which are far away from transit stations?

Measuring angle and distance from one transit station
Measuring distance from two points on traverse line
Measuring angles to the point from at least two stations
Measuring angle at one station and distance from other

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