A theodolite is set up at station A and a 3 m long staff is held vertically at

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A theodolite is set up at station A and a 3 m long staff is held vertically at station B. The depression angle reading at 2.5 m marking on the staff is 6°10´. The horizontal distance between A and B is 2200 m. Height of instrument at station A is 1.1 m and R.L. of A is 880.88 m.Apply the curvature and refraction correction, and determine the R.L. of B (in m). __________

Options:

A . 641.9 to 642.3

B . 534.6 to 535.2

C . 127.4 to 128.1

D . 212.0 to 212.5

Answer: Option A

-NA-

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