engineering recuitment UKPSC Polytechnic Lecturer Mock Test 2024 Surveying Levelling

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 __________.

1
Zero
2
0.06735 d2 meters
3
\(\frac 2 3 d^2\) meters
4
0.057 d2 meters
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