In surveying optical square is used to setting out right angles. The h – McqOptions

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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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