In a theodolite the line passing through the intersection of the horizontal and vertical
cross hairs and the optical centre of the object glass and its continuation, is known as
(a) Horizontal axis
(b) Vertical axis
(c) Line of collination
(d) Line of sight
(e) Either of c or d above*
cross hairs and the optical centre of the object glass and its continuation, is known as
(a) Horizontal axis
(b) Vertical axis
(c) Line of collination
(d) Line of sight
(e) Either of c or d above*