Question

How much change is the elevation of surface corresponds to the single fringe interval in surface contour test?

(a) 0.0005 mm

(b) 0.0025 mm

(c) 0.025 mm

(d) 0.05 mm

The question was posed to me in my homework.

My enquiry is from Surface Contour Test in portion Measurement by Light-Wave Interference of Engineering Metrology

Answer 1

Right answer is (b) 0.0025 mm

Easy explanation: In surface contour test, the change in elevation of surface corresponds to each fringe interval shows clearly the precision of this method. Value of this change in elevation is 0.0025 millimeter.