= Optical square
{wiki=Optical_square}
An optical square is a specialized surveying instrument used in the field of civil engineering, construction, and surveying to ensure right angles, especially in laying out foundations, roads, and other structures. It provides a method for achieving precise right-angle measurements through the use of mirrors or prisms. \#\#\# Key Features and Components: 1. **Construction**: Typically consists of two or more arms that are set at a 90-degree angle to each other.
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