Surveying
The relation between the air base (B), photographic base (b), flying height (H) and the focal length (f) of a vertical photograph, is

B =f/bH
B = H/bf
B = b/fH
B = bH/f

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Surveying
Which of the following errors is not eliminated by the method of repetition of horizontal angle measurement ?

error due to inaccurate graduation
error due to displacement of station signals
error due to eccentricity of verniers
error due to wrong adjustment of line of collimation and trunnion axis

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