In an external focussing tacheometer, the fixed interval between stadia hairs is 5mm; the focal length of the objective is 25cm and the distance of the vertical axis of the instrument from the optical centre of the objective is 15cm. Which one of the following is the set of constants of the tacheometer?

- 1
  
  30, 0.15
- 2
  
  30, 0.40
- 3
  
  50, 0.25
- 4
  
  50, 0.40

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