The least count of a vernier callipers is equal to:

The difference in the values of one main scale division and one vernier scale division.

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The length of total number of divisions on its vernier scale.

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The value of one division on its main scale.

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The length of one division on its vernier scale.

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Solution

The correct option is A The difference in the values of one main scale division and one vernier scale division.
Least count of vernier scale is given by the ratio of least count of main scale to the number of vernier scale divisions. On further derivations, it can be concluded to be equal to the difference in the values of one main scale division and one vernier scale division.

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