You 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 callipers is used for lengths to an accuracy of 10-4 m. A screw gauge and a spherometer can be used to measure lengths as less as to 10-5 m. To measure lengths beyond these ranges, we make use of some special indirect methods.
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