15 number of division on Vernier scale and 12 cm on the main scale means 13.2 cm of the object thickness.
A Vernier scale has 10 divisions and the total length of these 10 divisions is equal to the length of 9 divisions of the main scale that equals to 9 mm so in this way 15 number of division on Vernier scale means 14 divisions on the main scale which is equals to 14 mm and we know that there is 12 cm on the main scale so by adding 12 cm and 14 mm we get the 13.2 cm reading of the object thickness. Vernier caliper is a measuring device that comprise of a main scale and a sliding jaw with an attached Vernier.
So we can conclude that 15 number of division on Vernier scale and 12 cm on the main scale means 13.2 cm of the object thickness.
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