If `S and V` are one main scale and one Vernier scale and ` n - 1` divisions on the main scale are equivalent to `n` divisions of the Vernier , then

Options

A. The least count is `S//n`.
B. The Vernier constant is `S//n`.
C. The same Vernier constant can be used for circular Vernier also.
D. The same vernier constant cannot be used for circular Verniers.

Answer

A, B, C

Explanation

Least count ` = 1 MSD - 1 VSD`
` = S - V = S - ((n-1)/( n)) S = ( S)/(n)`
`[ because nV = ( n-1) S]`
It is also called vernier constant .
So choices (a) and (b) are correct.
Choice (d) is wrong and choice ( c) is correct , since for all vernier scales similiar approach can be used.