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Curvature of bands is more. What does this statement indicate when surface is tested under surface contour test?

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Curvature of bands is more. What does this statement indicate when surface is tested under surface contour test?

(a) More convexity

(b) More concavity

(c) Flat surface

(d) More scratches

I have been asked this question in homework.

I'm obligated to ask this question of Surface Contour Test topic in portion Measurement by Light-Wave Interference of Engineering Metrology

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Correct option is (a) More convexity

For explanation: The magnitude of concavity and convexity can be had by bands curvature. If the band curvature is more it shows more convexity and opposite to this indicates concavity. So we can have an idea of concavity or convexity by this.

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