An imaginary line passing through the optical centre of the objective and the optical centre of the eye-piece in the telescope of a surveying instrument is called the

An imaginary line passing through the optical centre of the objective

1.	An imaginary line passing through the optical centre of the objective and the optical centre of the eye-piece in the telescope of a surveying instrument is called the
A.	horizontal axis
B.	line of collimation
C.	optical axis of the telescope
D.	reference axis
Answer» C. optical axis of the telescope

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An imaginary line passing through the optical centre of the objective and the optical centre of the eye-piece in the telescope of a surveying instrument is called the

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