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While carrying out adjustments of dumpy level, the following observations were made:
(i) Instrument exactly at midpoint of line AB.
Staff Reading at station A = 2.8 m
Staff Reading at sation B = 2.6 m
(ii) Instrument very near to station B.
Staff Reading at station A = 1.65 m
Staff Reading at station B = 1.85m
Find out the correct staff reading at A when the instrument is near the station B.
  • a)
    1.25m
  • b)
    1.65m
  • c)
    2.05m
  • d)
    2.25m
Correct answer is option 'C'. Can you explain this answer?
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While carrying out adjustments ofdumpy level, the followingobservation...
Given Data:
- Staff Reading at station A when the instrument is exactly at midpoint of line AB = 2.8m
- Staff Reading at station B when the instrument is exactly at midpoint of line AB = 2.6m
- Staff Reading at station A when the instrument is very near to station B = 1.65m
- Staff Reading at station B when the instrument is very near to station B = 1.85m

Calculations:
- The correct staff reading at station A can be found by considering the change in readings when the instrument is moved from midpoint to very near station B.
- The difference in staff readings at station A when the instrument is at midpoint and very near station B is 2.8m - 1.65m = 1.15m.
- The difference in staff readings at station B when the instrument is at midpoint and very near station B is 2.6m - 1.85m = 0.75m.
- Since the instrument was moved towards station B, the difference in readings should be added to the staff reading at station A when the instrument is very near to station B.
- Therefore, the correct staff reading at station A when the instrument is near station B = 1.65m + 1.15m = 2.05m
Therefore, the correct staff reading at station A when the instrument is near the station B is 2.05m, which corresponds to option 'C'.
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While carrying out adjustments ofdumpy level, the followingobservations were made:(i) Instrument exactly at midpointof line AB.Staff Reading at station A = 2.8 mStaff Reading at sation B = 2.6 m(ii) Instrument very near to stationB.Staff Reading at station A = 1.65 mStaff Reading at station B = 1.85mFind out the correct staff readingat A when the instrument is near thestation B.a)1.25mb)1.65mc)2.05md)2.25mCorrect answer is option 'C'. Can you explain this answer?
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