10 VSD = 9 MSD
FIND TOTAL READING
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- L.C(Least Count) = 1 M.S.D(1-m/n)
L.C = 0.1cm(1-9/10)
L.C = 0.1cm(10-9/10)
L.C = 0.1cm × 0.1
L.C = 0.01cm
# Note: 1 M.S.D(Main Scale Division) = 0.1 cm
m = 9 M.S.D
n = 10 V.S.D
∵ Generally 10 V.S.D = 9 M.S.D (Same in this question).
Now,
- M.S.R = 12.2 cm
- V.S.R = L.C × coinciding division of Vernier Scale
= 0.01cm × 7
= 0.07cm
- T.R(Total Reading) = M.S.R(Main Scale Reading) + V.S.R(Vernier Scale Reading)
= 12.2cm + 0.07cm
= 12.27cm
Answer: 12.27cm
- Do not get confused with the starting tip of the V.S(Vernier Scale) as the starting 0. The Vernier Scale's zero is between 12.2cm and 12.3cm of Main Scale.
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