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Question
In a theodolite the line of collimation is
fFk;ksMksykbV eas] lekarj.k js[kk dSlh gksrh gS 
A.
Parallel to axis of plate levels
B.
Parallel to the vertical axis
C.
Perpendicular to the trunnion axis
D.
Parallel to the horizontal axis
Answer ( Option C)

Perpendicular to the trunnion axis

Solution

There are five fundamental lines in a Theodolite: 
1. Vertical axis (Azimuth axis):  It is the axis about which the instrument rotates in the horizontal plane. 
2. Horizontal Axis (Trunnion axis): It is the axis about which the instrument rotates in the vertical plane. 
3. Line of Collimation (Line of Sight):  It is the line that passes through the intersection of horizontal and vertical crosshairs and the optical center of the object glass. 
4. Bubble Line (Level tube axis or Altitude level axis): It is a straight line tangential to the longitudinal curve of the level tube at its center. It is horizontal when the bubble is in the center. 
5. Plate level axis: It is perpendicular to the vertical axis when the bubble is at the center.
Permanent adjustment of theodolite is done by four steps:  
Adjustment of plate level 
Adjustment of the line of sight 
Adjustment of the horizontal axis 
Adjustment of altitude level

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