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In a vernier callipers, `1 cm` of the main scale is devided into `20` equal parts. `19` divisions of the main scale coincide with `20` divisions on the vernier scale . Find the least count of the instrument.

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Correct Answer - B::C
The value of one main scale division = `1/ (20) cm`
Number of divisions on vernier scale `= 20`
`LC = ("value of one main scale division")/("Number of divisions on vernier scale")`
`(1/20)/20 = 1 /(400) = 0.0025 cm`.

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