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Question
Which of the following errors cannot be eliminated by taking both face observations ?
Options:
A .  error due to horizontal axis not being perpendicular to the vertical axis
B .  index error i.e. error due to imperfect adjustment of the vertical circle vernier
C .  error due to non-parallelism of the axis of telescope level and line of collimation
D .  none of the above
Answer: Option D
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