5) Mark on wall A the intersection point as a1, and on wall C
mark the intersection point as c1 (see figure 1).
A
a1
x
0.5 m
6) Turn the laser 180° and reposition it. Verify that the 2 vertical
beams pass through a1 and c1 points.
7) Mark on wall B the intersection point as b1(see figure 2).
180°
A
a1
x
0.5 m
C
c1
x
2 m
Figure 1
C
c1
x
2 m
Figure 2
B
B
b1
x
15