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

- 1
  
  $\frac{f}{H s e c θ}$
- 2
  
  $\frac{f s e c θ}{H}$
- 3
  
  $\frac{f}{H}$
- 4
  
  $\frac{f}{H \cos \frac{1}{2} θ}$

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