Surveying
The rate of change of parallax dp/dh with respect to change in h, may be expressed as

fB/(H - h)²
fB/(H + h)²
fB/(H + h)
fB/(H - h)

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Surveying
The necessary geometrical condition for triangulation adjustment is:

The sum of the eight angles of a braced quadrilateral should be 360°
The sum of the three angles of a plane triangle should be 180°
The sum of the angles around a station should be 360°
All listed here

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Surveying
The difference between a level line and a horizontal line is that

both are same
horizontal line is normal to plumb line while level line may not be normal to the plumb line
level line is a curved line while hori-zontal line is a straight line
level line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line

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