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    Calculate the combined correction, due to refraction and Earth's curvature, in levelling (surveying) for a distance of 2500 m.
    Question

    Calculate the combined correction, due to refraction and Earth's curvature, in levelling (surveying) for a distance of 2500 m.

    A.

    0.070 m

    B.

    0.420 m

    C.

    0.490 m

    D.

    0.168 m

    Correct option is B


    Combined correction = 0.0673 (d)²
    d = 2.5 km
    Combined correction = 0.0673 × (2.5)²
    = 0.420 m

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