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Which of the following indicate the exact point of equality when the comparison of lengths of two slip gauges takes place?

(a) A prominent white band

(b) A prominent black band

(c) A prominent black & white band

(d) A prominent grey band

I have been asked this question in an online quiz.

My doubt stems from Checking of Slip Gauges topic in chapter Testing and Calibration of Gauges and Dynamic Measurement of Engineering Metrology

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Right answer is (b) A prominent black band

Best explanation: A prominent black band indicates the exact point of equality which has other bands, fringed with colour on either side, successive bands being of minimised intensity until invisible.

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