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

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Surveying
The cross hairs in the surveying telescope are placed

much closer to the eye-piece than to the objective lens
anywhere between eye-piece and objective lens
midway between eye piece and objec-tive lens
much closer to the objective lens than to the eye piece

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