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Which one of the following statements is correct ? | |
A. | when the axes of rotation of the graduated circle and the verniers are not coincident, the instrument possesses eccentricity [Wrong Answer] |
B. | the mean of the readings of the two verniers gives correct reading free from the eccentricity [Wrong Answer] |
C. | one vernier may be used if the readings of two verniers differ by a constan [Wrong Answer] |
D. | all the above. [Correct Answer] |