A level was set up at a point A and distance to the staff station B was 100 m . The net combined correction due to curvature and refraction as applied to the staff reading is

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  1. 0.00673 m .
  2. 0.000673 m .
  3. -0.000673 m .
  4. -0.00673 m .

Answer (Detailed Solution Below)

Option 3 : -0.000673 m .
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Concept:

Combined correction for curvature and refraction is given by:

C = Cc + CR

C = - 0.0785 d2 + 0.01122 d2

C = - 0.06735 d2

Calculation:

d = 100 m = 0.1 km

C = -0.06735 d2

where d is in km, C is in m

C = - 0.06735 x 0.12 = - 0.000673 m

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