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How much a stylus instrument can be magnified to plot or find minute irregularities?

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in Engineering Metrology by (829k points)
How much a stylus instrument can be magnified to plot or find minute irregularities?

(a) 50 times

(b) 500 times

(c) 5000 times

(d) 50,000 times

This question was posed to me by my college professor while I was bunking the class.

Asked question is from Surface Roughness topic in division Measurement of Surface Finish of Engineering Metrology

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The correct choice is (d) 50,000 times

For explanation I would say: The shape of the hills and valleys is best studied in a cross-section normal to the surface using a stylus instrument which plots a graph in which even the minute irregularities are magnified upto 50,000 times whereas the length over which observations are made is magnified only by 50-300 times.

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