The following measurements were made during testing a levelling instrument.
P1 is close to P and Q1 is close to Q. If the reduced level of station P is 100.000 m, the reduced level of station Q is
99.000 m
100.000 m
101.000 m
102.000 m
101.000 m
Given :(RL)P = 100m
Case 1: When instrument neat at P1,
Case 2: When instrument near at Q1 ,
Difference in elevation,
Hence, the correct option is (C).
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