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

1.00 mm
1.1 mm
0.5 mm
0.1 mm

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Surveying
The meridian of a place is

A great circle passing through the place and the poles
A great circle whose plane is perpendicular to the axis of rotation and it also passes through the place
An arc of the great circle which passes through the place and is perpendicular to the equator
A semi-circle which passes through the place and is terminated at the poles

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Surveying
Theodolite is an instrument used for

measurement of both horizontal and vertical angles
measurement of horizontal angles only
tightening the capstan-headed nuts of level tube
measurement of vertical angles only

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