In a typical vernier calliper, 50 divisions of the Vernier scale occupy 49 divisions on the main scale. While measuring the diameter of a rod, the main scale reading shows 24 mm and the 20th Vernier scale division coincides with the main scale. What is the diameter of the rod?
1
24.4 mm
2
24.04 mm
3
24.2 mm
4
24.02 mm