Which of the following errors can be eliminated by reciprocal measurements in differential levelling ? I Error due to earth s curvature II Error due to atmospheric refraction

Which of the following errors can be eliminated by reciprocal measurem

1.	Which of the following errors can be eliminated by reciprocal measurements in differential levelling ? I Error due to earth s curvature II Error due to atmospheric refraction
A.	Both I and II
B.	I only
C.	II only
D.	Neither I nor II
Answer» B. I only

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Which of the following errors can be eliminated by reciprocal measurements in differential levelling ? I Error due to earth s curvature II Error due to atmospheric refraction

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Which of the following errors can be eliminated by reciprocal measurements in differential levelling ?
I Error due to earth s curvature
II Error due to atmospheric refraction