Answer :
Option A and B both are correct answer
What is the Vernier?
Vernier, a Frenchman, invented the vernier calliper in 1631 as a tool for taking extremely precise linear measurements. It employs two graduated scales: the vernier, a specifically graduated auxiliary scale that slides parallel to the main scale and allows readings to be made down to a fraction of a division on the main scale, and a main scale that is comparable to that on a ruler.
Vernier Sizing
The vernier scale takes precise measurements. It contains two scales: a regular, huge scale (the main scale) and a smaller scale inside that is used to accurately compute measurements.
Due to the vernier acuity idea upon which it is built, the vernier scale provides accurate measurement. The misalignment of two line segments is measured by the vernier acuity, a form of visual acuity. Aligned and misaligned lines are easily distinguishable by the human eye.
Vernier Calipers have the following three main applications:
It is employed to gauge a tube's or cylinder's inside diameter.
It is helpful for determining an object's length.
The diameter of circular objects is often measured using a vernier calliper.
Vernier callipers are beneficial for a variety of tasks in addition to these, such as in the industrial sector and for professionals and engineers.
It is used to make wavelength measurements.
it is used to measure the mass of the experimental substance
Therefore both option A and B are correct answer
Learn more about Vernier from given link
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