If the back sight and fore sight distance are kept equal during levell – McqOptions

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1.	If the back sight and fore sight distance are kept equal during levelling observation, then the effect of both refraction and earth’s curvature will be __________.
A.	Zero
B.	0.06735 d2 meters
C.	\(\frac 2 3 d^2\) meters
D.	0.057 d2 meters
Answer» B. 0.06735 d2 meters

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