The imaginary line joining the point of inter section of crosshair at diaphragm and the optical centre of the object glass and its continuation is
AAxis of the level tube
BLine of collimation
CAxis of the telescope
DNone of the above
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Related Questions:
The reduced bearing of the reading 252° is
Closed contours of decreasing values towards their center represent:
First sight taken on turning point:
The circle of contact of earth and the cone of visual rays passing through the point of observation is called:
Chain used for survey work in the recent times: