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In tacheometric surveying the focal length of objective and stadia interval is 20 cm and 4 mm. Staff intercept is 1 m. Line of sight is perpendicular to staff. The horizontal distance between instrument and staff by assuming additive constant zero, is A)60m B)50m C)80m D)100m?
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In tacheometric surveying the focal length of objective and stadia int...
Tacheometric Surveying Calculation

Given parameters:

- Focal length of objective (f) = 20 cm
- Stadia interval (s) = 4 mm
- Staff intercept (IS) = 1 m
- Additive constant (C) = 0

To find:

- Horizontal distance (d) between instrument and staff

Solution:

1. Tacheometric Formula
The tacheometric formula used to calculate the horizontal distance is:

d = IS × f / s

2. Substituting Values
Substituting the given values in the formula, we get:

d = 1 × 20 / 0.004
d = 5000 cm
d = 50 m

Therefore, the horizontal distance between the instrument and staff is 50 meters.

Answer: B) 50m
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In tacheometric surveying the focal length of objective and stadia interval is 20 cm and 4 mm. Staff intercept is 1 m. Line of sight is perpendicular to staff. The horizontal distance between instrument and staff by assuming additive constant zero, is A)60m B)50m C)80m D)100m?
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