Observation of a slip gauge on flatness interferometer produced fringe counts numbering 10 and 14 for two readings.The second reading is taken by rotating the setup by 180 . Assume that both faces of the slip gauge are flat and the wavelength of the radiation is 0.5086 m. The parallelism error (in m) between the two faces of the slip gauge is

Observation of a slip gauge on flatness interferometer produced fringe

1.	Observation of a slip gauge on flatness interferometer produced fringe counts numbering 10 and 14 for two readings.The second reading is taken by rotating the setup by 180 . Assume that both faces of the slip gauge are flat and the wavelength of the radiation is 0.5086 m. The parallelism error (in m) between the two faces of the slip gauge is
A.	0.2543
B.	1.172
C.	0.5086
D.	0.800
Answer» D. 0.800

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