In levelling, the correction for combined curvature and refraction (in metres) is equal to ?

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Vikash Gupta

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Q. In levelling, the correction for combined curvature and refraction (in metres) is equal to ?

(A) 0.0785 D²
(B) 0.00785 D²
(C) 0.0673 D²
(D) 0.0112 D²

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✅ Correct Answer: (C) 0.0673 D²

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