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What is the method to find low and high spots?

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What is the method to find low and high spots?

(a) Pressure by weight test

(b) Volume test

(c) Pressure test

(d) Density test

This question was posed to me in examination.

My question is taken from Surface Contour Test topic in chapter Measurement by Light-Wave Interference of Engineering Metrology

1 Answer

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Correct answer is (c) Pressure test

Easiest explanation: Two low or high spots can be checked by pressure test. If pressure is applied at a point and fringes move closure than the surface is valley. By applying pressure if fringes move apart then the surface is hill.

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