Activity 2In a test for parallelism, the fringe patterns on Grade 0 andGrade 2 gage blocks were compared. The fringe patternsobtained are shown in Figure (a). If the wavelength of the lightused is 0.585µm, determine the difference in height between (i)point A and point B, and (ii) point B and point C.If the optical flat is rotated and the fringe pattern producedon Grade 0 block gage is as shown in Figure (b), sketch the fringepattern that may be observed on Grade 2 block gage.BCADGrade 0Grade 2F

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