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Measurement of Length

We are already familiar with some direct methods for the measurement of length.

For example, a metre scale is used for lengths from 10–3 m to 102 m.

A Vernier Calliper is used for lengths to an accuracy of 10–4 m.
A Screw Gauge can be used to measure lengths as less as 10–5 m.
To measure lengths beyond these ranges, we make use of some special indirect methods.

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