1.

Which of the below is not an instrument used to set right angles?(a) Cross staff(b) Site square(c) Optical staff(d) Prism square

Answer» Right option is (c) Optical staff

Best explanation: There is no instrument like an optical staff.  Optical square is an instrument which consists of circular box with three slits. Cross staff is a frame of the box mounted on a pole. Prism square is an advanced version of an optical square. Site square consists of two telescopes set at 90^os.


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