Question

What is a vernier coincidence?

Answer 1

Hint: Vernier calliper is a type of scale which is used for making accurate and precise measurements. It was a French mathematician Pierre Vernier, who invented the Vernier calliper in 1631.

Complete step by step solution:
A vernier calliper is used to measure the diameters of cylinders and other round objects as it is designed in a way that it can make very accurate linear measurements. It consists of two scales: a main scale and an inside scale. The jaws of the vernier calliper are positioned to the outer and inner part of the object in accordance with these scales. The scales are positioned in a way that the aligned and the non aligned lines of both the scales can be easily observed by the human naked eye. The division on which the lines of the vernier scale coincide with the lines of the main scale is known as vernier coincidence.

Note: The difference between one main scale division and one vernier scale division of a vernier calliper is known as its least count. In general, the least count of vernier callipers is 0.1mm. Sometimes, it happens that the zero reading of the vernier scale and the main scale do not coincide with each other properly. The vernier calliper at that point is said to have zero error. Zero error is also of two types: positive and negative error. It depends whether zero division of the vernier scale is positioned right to the main scale or to the left of the main scale.