Correct Answer - Option 3 : 101.455
Explanation:
Given
Staff
Station
|
BS
|
IS
|
FS
|
RL
|
P
|
1.655
|
|
|
100.00 m |
Q
|
- 0.950
|
|
-1.500
|
|
R
|
|
|
0.750
|
?
|
We know
Height of Instrument (HI) = RL + Back sight (BS)
RL at any point = HI - Fore Sight (FS)
HI at P = 100 + 1.655 = 101.655 m
RL of Q = HI @ P - FS = 101.655 - (-1.500) = 103.155 m
HI @ Q = RL @Q + BS @ Q = 103.155 + (- 0.950) = 102.205
RL of R = HI @Q - FS @ Q = 102.205 - 0.750 = 101.455 m
S.NO.
|
BS
|
IS
|
FS
|
HI
|
RL
|
Remark
|
P
|
1.655
|
|
|
101.655
|
100 |
Bench Mark
|
Q
|
- 0.950
|
|
-1.500
|
102.205
|
103.155
|
|
R
|
|
|
0.750
|
|
101.455
|
|