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Question

A vernier has 10 divisions and they are equal to 9 divisions of the main scale in length. If the main scale is calibrated in mm, what is its least count?

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Solution

Step 1, Given data

Value of 1 m.s.d. = 1 mm

10 vernier divisions = 9 m.s.d.

Step 2, Finding the least count

We know,

L.C. = Valueof1msdNumberofdivisionsonvernierscale

Putting all the values

LC=110=0.1

Hence the least count is 0.1 mm or 0.01 cm


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