Which of the following error is not eliminated by the method of repetition of horizontal angle measurement?

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

The representation of general topography of a very flat terrain is possible only ............

The length of peg interval for flat curves is ............

Removal of parallax, may be achieved by focusing ............

The stadia lines of a tacheometer are ............

The surface if zero elevation around the earth, which is slightly irregular and curved, is known as ............

An instrument used for ranging is ............

The real image of an object formed by the objective, must lie ............