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
Pick up the incorrect statement from the following. In a spherical triangle

Every angle is less than two right angles
Sum of the three angles less than six right angles and greater than two right angles
Sum of any two sides is greater than the third
Sum of the three angles is equal to two right angles

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