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
Spring tides are caused when

None of these
Sun and moon are in line with earth
Solar tidal force acts opposite to lunar tidal force
Solar tidal force and lunar tidal force both coincide

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