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Which of the below is not an instrument used to set right angles?

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in Basic Civil Engineering by (111k points)
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

I have been asked this question by my college director while I was bunking the class.

Asked question is from Chain Surveying in portion Basic Surveying of Basic Civil Engineering

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Best 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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