The main purpose of focusing the eyepiece of a theodolite is to obtain a sharp image of the:
Correct answer: D. Cross-hairs
- A. Object point
- B. Vertical axis
- C. Levelling screws
- D. Cross-hairs
Explanation
The eyepiece is focused to make the cross-hairs appear sharp to the observer. The objective focusing knob is then used to obtain a clear image of the observed object.
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About Surveying
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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