If the horizontal distance between the staff point and the point of observation is d, then the error due to curvature of earth is proportional to
A. d
B. 1/d
C. d2
D. 1/d2
Answer:C
If the horizontal distance between the staff point and the point of observation is d, then the error due to curvature of earth is proportional to
A. d B. 1/d C. d2 D. 1/d2