If v, t and $\frac{f}{H}$ are ground speed of the aircraft, the shutter speed of the camera and the scale of the photograph respectively, then the amount of image displacement

- 1
  
  i $i = \frac{v . t . H}{f}$
- 2
  
  $i = v . t \frac{f}{H}$
- 3
  
  $i = \frac{v . f}{t . H}$
- 4
  
  $i = \frac{t . H}{v . f}$

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