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

- 1
  
  B= $\frac{b H}{f}$
- 2
  
  B= $\frac{f}{b H}$
- 3
  
  B= $\frac{b}{f H}$
- 4
  
  B= $\frac{H}{b f}$

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