The reciprocal levelling method eliminates errors due to which of the following factors?
ACollimation error only
BCurvature and refraction errors only
CBoth collimation error and combined curvature/refraction errors
DPersonal reading errors of surveyor
Explanation
Reciprocal levelling eliminates line of collimation error, curvature error, and atmospheric refraction error when finding height differences across wide rivers or valleys without intermediate setups.
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