The line joining the optical centre of a surveying telescope to the centre of its cross-hairs is called the:
Correct answer: B. Line of collimation
- A. Vertical axis
- B. Line of collimation
- C. Horizontal axis
- D. Axis of bubble tube
Explanation
The line of collimation, also called the line of sight, passes through the optical centre of the objective and the intersection of the cross-hairs. The vertical and horizontal axes describe instrument rotation axes, not the sighting line.
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Surveying covers measurement of distances, angles and elevations, traversing, levelling, contouring, plane table work, theodolites, total stations and basic photogrammetry. It includes error adjustment, coordinate calculations, area and volume determination, and the distinction between accuracy and precision, as well as between temporary and permanent adjustments.
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