Pls ans Q12:
12. The main scale of a Vernier calliper is calibrated in mm and 19 divisions of the main scale are equal to 20 divisions of the Vernier scale. While measuring the diameter of a cylinder with this instrument, the main scale reads 45 divisions and the 6th division of the Vernier coincides with the main scale division. Find the
(a) least count of the Vernier      [Ans; 0.005 cm]
(b) diameter of the cylinder        [Ans : 5.530 cm]​