Question

Up to which accuracy differences in length can be measured when slip gauges are calibrated by interferometer?

(a) 0.02 mm

(b) 0.002 mm

(c) 0.0002 mm

(d) 0.00002 mm

This question was addressed to me by my school principal while I was bunking the class.

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

Answer 1

The correct choice is (d) 0.00002 mm

For explanation I would say: The gauges show interference fringes across the faces at both ends after simple adjustment, and from the relative positions of these differences in length accuracy achieved is 0.00002 mm.