The instrument, belonging to a class of reflecting instrument is ............

A change point is ............

The angle between two plane mirrors of the optical square is kept ............

Local attraction in compass surveying may exist due to ............

Ramsden eye-piece consists of ............

The direct angles may have any value between ............

Profile leveling is usually done for determining ............

In an internal focusing type of telescope, the lens provided is ............

In Indian tangent clinometer is associated with ............