The 'angular accuracy' of theodolite observations is improved by:
Choose the correct answer
Only increasing telescope magnification
Multiple sets on different circle graduations, FL+FR, and repetition — systematic errors cancelled, random reduced by √n
Using older instruments with fixed readings
Surveying only in calm weather with no correction
Correct Answer
B. Multiple sets on different circle graduations, FL+FR, and repetition — systematic errors cancelled, random reduced by √n
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Improving angular accuracy: (1) Multiple sets of observations on different parts of circle (eliminates graduation errors); (2) Face left + face right (eliminates collimation and horizontal axis errors); (3) Repetition method (cumulative measurement divided by n repetitions); (4) Reiteration (direct and reverse to avoid graduation errors). Random errors reduce by √n.
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