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Question

 Identify the instument as shown in figure below which is used in chain surveying?


    

A.

Prism


B.

Prism Pole


C.

Laser Distance Meter

D.

Optical Square


Answer ( Option D)

Optical Square


Solution

The instrument  shown in figure is optical square

The optical square uses a pentaprism to reflect and refract a beam or sighting 90 degrees, it is used in pairs in surveying and in a singular block in metrology.


Laser Distance Meter



Prism Pole


Prism




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