If pB and $∆ p$ be the parallax to B and difference in parallaxes to A and B respectively, on a pair of stereo photographs having focal length f and the groung base B, the difference in their heights, is

- 1
  
  $∆ h = \frac{p B . B f}{∆ p + p B}$
- 2
  
  $\frac{∆ p . B f}{p B (∆ p + p B)}$
- 3
  
  $∆ h = \frac{∆ p . B f}{p B (p B - ∆ p)}$
- 4
  
  $\frac{∆ P . B f}{p B ∆ p}$

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