When the effect of refraction is taken into account in levelling, the true staff reading is obtained by subtracting the correction for refraction from the observed staff reading.

Related MCQs

• When the effect of curvature is taken into account in levelling, the true staff reading is obtained by
• It is required to find the difference in elevation between two points A and B. During levelling, it is found that the staff reading at B is more than the staff reading at A. It indicates that the point A is
• In levelling, the correction for curvature (in metres) is equal, where D = Distance from the level to the staff reading in kilometres.
• In levelling, the correction for combined curvature and refraction (in metres) is equal to
• In levelling, the effect of refraction may be taken as
• When a staff is sighted through the telescope, a certain length of staff is intercepted by the stadia lines. The staff intercept varies with the distance at which the staff is held.
• In levelling, the effect of refraction varies with the atmospheric conditions
• Refraction correction
• Correction required for refraction for a distance of 10 km is….
• Combined correction for curvature and refraction for 800 m distance is……