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What is the nature of the surface if curve bands around the line of contact when the surface is tested under surface contour test?

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What is the nature of the surface if curve bands around the line of contact when the surface is tested under surface contour test?

(a) Convex surface

(b) Concave surface

(c) Flat surface

(d) May be convex or concave

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The question is from Surface Contour Test in division Measurement by Light-Wave Interference of Engineering Metrology

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The correct answer is (a) Convex surface

The explanation: If band curves around the line of contact or point then the given surface is convex but if the band curves opposite to the line of contact or point then the surface is a concave surface.

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