I want step by step derivation of least count.

Asked by Bhanupriya Khurana | 28th Jun, 2013, 08:00: PM

Expert Answer:

Least count is the minimum measurement that can be made by a measuring device. 

 Least count of a vernier callipers = minimum measurement on main scale / total number of divisions on vernier scale. 

Let’s derive this:

Where S is the value of 1 Main scale division and N is the number of equal divisions on the vernier scale.

 

Least count of a screw gauge = minimum measurement on main scale / total number of divisions on

 

Smaller is the magnitude of least count of a measuring instrument, more precise the measuring.

Answered by  | 29th Jun, 2013, 11:33: PM

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