What will be the reduced level of top of power (point Q) given in figure with accessible base and neglecting the effect of curvature and refraction. Reduced level of point 'P' = X, D = horizontal distance. α = angle, h' = height of instrument.
1
[X - h' + D * tanα + 0.06735*D2]
2
[X + h' - D * tanα]
3
[X + h' + D * tanα]
4
[X + h' + D * tanα + 0.06735*D2]