Computer · Levelling
Two hilltops A and B, 20 km apart, are intervened by a third hilltop C midway. If the topmost contours of all three hilltops have the same elevation value, then owing to the Earth's curvature and refraction, the line of sight AB:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Is exactly tangent to the surface at C
- 2Just grazes the hilltop C
- 3Passes below hilltop C (obstructed)✓
- 4Passes clear above hilltop C
Correct answer
Passes below hilltop C (obstructed)
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