The angle of intersection of the two plane mirrors of an optical square is

a) 30°
b) 45°
c) 60°
d) 90°
Ans: b

  If the R.L. of a B.M. is 100.00 m, the back- sight is 1.215 m and the foresight is 1.870 m, the R.L. of the forward station is

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