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What is the flatness of reflecting faces of precision polygons?

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What is the flatness of reflecting faces of precision polygons?

(a) Within 0.0002 mm

(b) Within 0.0001 mm

(c) Within 0.0003 mm

(d) Within 0.0004 mm

I had been asked this question during an online interview.

The origin of the question is Precision Polygons topic in portion Angular Measurement and Circular Division of Engineering Metrology

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The correct answer is (b) Within 0.0001 mm

To elaborate: The reflecting faces of precision polygons should be flat with in 0.0001 mm. If individual mirrors are used then they should be mounted in such a way that there is no distortion. The mirror position should be fixed or there should be no possibility of alterations of mirror position from bumping or poor mounting.

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