An optical square is used for the same purpose as the cross-staff, but it is more accurate.

Related MCQs

• The optical square is used to measure angles by
• The angle of intersection of the two plane mirrors of an optical square is
• The index glass in an optical square is
• The angle of intersection of the horizon glass and index glass in an optical square is
• In an optical square, the angle between the first incident ray and the last reflected ray is
• When the object lies on the left hand side of the chain line, then while taking offset with an optical square, it is held in
• The horizon glass in an optical square is
• Prismatic compass is considered more accurate than a surveyor's compass, because
• Which method is more accurate for calculation of RL?
• Prism square works on the same principle as that of _______