engineering recuitment PGCIL Diploma Trainee Mock Test 2024 Surveying Levelling

In levelling, the distance between point of instrument position and the staff position (D) is in kilometres, then the correction for refraction (in m) is equal to:

1
0.0785 * D2
2
0.01121 * D2
3
0.0012 * D2
4
0.00785 * D2
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