A vernier scale has 10 divisions. It slides over the main scale, whose 1 M.S.D. is 1.0 mm. If the number of division to the left side of the zero of the vernier scale on the main scale is 49 and the 8th vernier scale division coincides with the main scale, calculate teh length in centimetres.

Explanation

N = 10
1 M.S.D = 1 mm
M.S.R = 49 mm
V.C = 8
`L = M.S.R + V.C xx L.C`
L.C= `(1MSD)/(10) = (1) /(10)` = 0.1 mm
l= `49 + `xx` 0.1` =49.8 mm = 4.98 cm