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What is an optical square?

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An optical square is a square refracting block which refracts an incident beam at an angle of 90 degrees.It can be used with an autocollimator for measuring squareness of a workpiece. read more

Optical square definition is - a small hand instrument used by surveyors for laying off a right angle by means of two mirrors set at an angle of 45 degrees. read more

Optical Square a very simple geodetic instrument that is used to lay off angles that are multiples of 90° or of 45°. In a prism square (see Figure 1), the direction of a ray originating from the flag on the right is changed by 90° after refraction and internal reflection. read more

In a prism square (see Figure 1), the direction of a ray originating from the flag on the right is changed by 90° after refraction and internal reflection. To lay off the angle by which the direction of the ray is changed, a second flag is set up in such a way that, when it is seen over the instrument, it is exactly above the image of the first flag in the instrument. read more

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Using An Optical Square
www.dpaw.wa.gov.au

What is OPTICAL SQUARE
thesciencedictionary.org