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Reciprocal levelling eliminate the effect of: 1. Errors due to atmospheric refraction 2. Errors due to earth’s curvature 3. Errors in staff reading 4. Errors due to collimation line Which of these statements are correct?

Reciprocal levelling eliminate the effect of: 1. Errors due to atmospheric refraction 2. Errors due to earth’s curvature 3. Errors in staff reading 4. Errors due to collimation line Which of these statements are correct? Correct Answer 1, 2 and 4

Explanation

Reciprocal levelling is adopted to accurately determine the level difference between two points which are separated by obstacles like a river, ponds, lakes, etc.

It eliminates the following errors:

  • error in instrument adjustments i.e error due to collimation
  • the combined effect of Earth's curvature and the refraction of the atmosphere
  • variation in the average refraction

Important Points

  • Reciprocal levelling eliminates the error due to collimation and error due to curvature of Earth completely, but as the refraction depends upon the atmosphere which may change every minute;

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