1.

In surveying optical square is used to setting out right angles. The horizon glass is placed at an angle of ______ with the horizon sight and index glass is placed at an angle of ______ with the index sight.

A. 30˚ and 15˚
B. 60˚and 45˚
C. 90˚and 75˚
D. 120˚ and 105˚
Answer» E.


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