(a) Derive a simple expression for the combined correction ' $h$ ' (in $m$ ) due to earth's curvature and atmospheric refraction in terms of the distance 'D' (in km ) between two levelling stations. The radius of earth is 6400 Km .
Explanation
The combined correction 'h' due to earth's curvature and atmospheric refraction can be expressed as a function of the distance between two levelling stations and the radius of the earth.
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