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Q: The accurate measurement of vertex distance during refractometry is required for what?
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What is the exactness of a measurement?

A measurement that can be repeated by an independent person or team of investigators.A measurement that includes the margin of error and resolution of the measuring equipment.


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What is meant by measurement is accurate but not precise?

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Why are the primitive ways of measurement not successful?

The answer depends on what you mean by "primitive" ways. When the Western Society was still pretty much primitive, the civilisations of ancient China, India, Mesopotamia and Central America were building things which required very accurate measurement.


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What are the two parts required to express measurement of a physical quantity?

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