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Given figure is a surface to be tested by surface contour test. How much lower or higher is B than Z in this given figure?

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Given figure is a surface to be tested by surface contour test. How much lower or higher is B than Z in this given figure?

(a) λ/4

(b) λ/2

(c) 3λ/2

(d) 3λ/4

The question was posed to me in an online interview.

I want to ask this question from Surface Contour Test topic in chapter Measurement by Light-Wave Interference of Engineering Metrology

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Right option is (b) λ/2

Best explanation: In the given figure, BYB is the contour. Y and Z are at the centre of two contours. The edge B is either higher or lower than Z by λ/2. The air gap will increase if we move away from X-X. BYB represents points at equal height, it means that B is higher than Z.

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