The scale of a vertical photograph of focal length $f$ taken from height of H metres above M.S.L., at a point of reduced level h,is

- 1
  
  $\frac{f}{h}$
- 2
  
  $\frac{f}{H + h}$
- 3
  
  $\frac{f}{H - h}$
- 4
  
  $\frac{H - h}{f}$

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