Mathematics · Trigonometric Levelling
In trigonometric levelling, the combined correction for curvature and refraction to be applied to the observed vertical angle (in angular measure) is given by which of the following expressions? (Where D is the horizontal distance, R is the radius of the Earth, and m is the coefficient of refraction)
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1D22R(1 - m)
- 2DR sin(1'')(1 + 2m)
- 3D2R sin(1'')(1 - 2m)✓
- 42DR sin(1'')(1 - m)
Correct answer
D2R sin(1'')(1 - 2m)
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