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What is the main purpose of micrometer eyepiece in the instrument used to compare the lengths of two slip gauges?

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What is the main purpose of micrometer eyepiece in the instrument used to compare the lengths of two slip gauges?

(a) Measure the fraction of bands

(b) To read the fringe

(c) Measure the length

(d) To measure the width of fringe

I have been asked this question in a job interview.

This key question is from Checking of Slip Gauges in chapter Testing and Calibration of Gauges and Dynamic Measurement of Engineering Metrology

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Best answer
Right option is (a) Measure the fraction of bands

Best explanation: In the instrument used to compare lengths of two slip gauges a micrometer eyepiece is present which accurately measure the fractions of bands, but it is better to estimate the fraction.

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