In optical square two mirrors are placed at an angle of to each other.
A30°
B90°
C180°
D45°
Home/
No.1 PSC Learning App
★
★
★
★
★
Related Questions:
The book in which the distance along the chain, the offset measurements and sketches of detail points are recorded :
The instrument used in plane tabling for obtaining horizontal and vertical distance directly without resorting is called
The operation of establishing intermediate points in survey line with end points :
The preliminary inspection of are to be surveyed is known as
If the magnetic bearing of the sun at a place at noon in Southern hemisphere is 167°, the magnetic declination at that place is