How is the phenomenon of interference used to test the optical flatness of a surface.

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written 8.1 years ago by

zuzu.zz299 • 0

modified 4.0 years ago by

krithikkm200 • 10

Subject: Applied Physics 2

Topic: Interference And Diffraction Of Light

Difficulty: Low

engineering physics

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written 8.0 years ago by

zuzu.zz299 • 0

The phenomenon of interference is used in testing the plainness/flatness of the surface. If the two surface OA and OB are perfectly plane, the air film between them gradually varies in thickness from O to A. The fringes are of equal thickness as each fringe is the locus of the points at which the thickness of film has a constant value. If the fringes are not of equal thickness, it means that surface are not plane.

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