what method use to measure very small length
Answers
Answer:
The meter was initially defined using a ruler before more accurate methods became available. Gauge blocks are a common method for precise measurement or calibration of measurement tools. For small or microscopic objects, microphotography where the length is calibrated using a graticule can be used.
Answer:
A meter scale is used for lengths from 1 mm to 100 m. A vernier caliper is used for lengths to an accuracy of 0.1 mm. A screw gauge and a spherometre can be used to measure lengths as small as to 0.01 mm. To measure lengths beyond these ranges, we make use of some special indirect methods. For e.g. large distances such as the distance of a planet or a star from the earth cannot be measured directly with a meter scale. Here, we use the parallax method.