**Find the Correction for Curvature**

**Mathematic Problem**

Find the correction for curvature for a distance of 900 m and 2.5 km.

**Solution**

1. When the distance is 900 m 0r 0.9 km

Correction for curvature (in meters) = 0.0785 D^{2}

After Putting the value of D in the above equation [D is in Km]

Correction for curvature (in meters) = 0.0785 × 0.9^{2} = 0.063 m

2. When the distance is 2.5 km

Correction for curvature (in meters) = 0.0785 × 2.5^{2} = 0.49 m

**Find the Correction for Refraction**

Mathematical Problem

Find the correction for refraction for a distance of 700 m and 1.5 km

Solution

1. When the distance is 700 m 0r 0.7 km

Correction for refraction (in meters) = 0.0112 D^{2} = 0.0112 × 0.7 ^{2} = 0.0055 m.

2. When the distance is 1.5 km

Correction for refraction (in meters) = 0.0112 D^{2} = 0.0112 × 1.5 ^{2} = 0.0252 m.

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