Pick up the incorrect statement from the following. The angular distance of heavenly bodies on observer's meridian measured from the pole, is

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

The scale of a tilted photograph of focal length f, taken from an altitude H, along the plate parallel through plumb point, is

‘H’ is the flying height above mean ground level and ‘f’ is the principal distance of a vertical photograph. The mean scale of the photographs is

Which of the following errors can be neutralised by setting the level midway between the two stations ?

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