While viewing through a level telescope and moving the eye slightly, a relative movement occurs between the image of the levelling staff and the cross hairs. The instrument is
Options
A. correctly focussed
B. not correctly focussed
C. said to have parallax
D. free from parallax.
Correct Answer
said to have parallax
More questions
1. Acid regression stage of sludge digestion at a temperature 21°C extends over a period of