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Question
Reciprocal levelling eliminates:-
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A.
Collimation error
B.
Collimation, curvature and refraction error
C.
Curvature and refraction error
D.
Curvature error fully and refraction error partly
Answer ( Option B)

Collimation, curvature and refraction error

Solution

Reciprocal levelling is adopted to accurately determine the level difference between two points which are separated by obstacles like a river, ponds, lakes, etc.

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