Consider the diameter of a spherical object being measured with the help of a Vernier callipers. Suppose its 10 Vernier Scale Divisions (V.S.D.) are…

Consider the diameter of a spherical object being measured with the help of a Vernier callipers. Suppose its $\displaystyle 10$ Vernier Scale Divisions (V.S.D.) are equal to its $\displaystyle 9$ Main Scale Divisions (M.S.D.). The least division in the M.S. is $\displaystyle 0.1$ cm and the zero of V.S. is at $\displaystyle x=0.1 \mathrm{~cm}$ when the jaws of Vernier callipers are closed. If the main scale reading for the diameter is $\displaystyle \mathrm{M}=5 \mathrm{~cm}$ and the number of coinciding vernier division is $\displaystyle 8$, the measured diameter after zero error correction, is