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What is the final stage of intermediate polishing using emery paper?

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in Engineering Material & Metallurgy by (773k points)
What is the final stage of intermediate polishing using emery paper?

(a) 3/0

(b) 4/0

(c) 5/0

(d) 6/0

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

Enquiry is from Metallography in division Tools of the Metallurgist of Engineering Material & Metallurgy

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Right answer is (b) 4/0

To explain: After mounting, the specimen is polished using emery paper containing fine abrasives. It starts by using No.1 paper, and then progresses to 1/0, 2/0, 3/0, and finally 4/0. Black spots found on magnification are oxide impurities of the specimen or mount.

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