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How is the phenomenon of interference used to test the optical flatness of a surface.
written 7.9 years ago by gravatar for neeta.vanage neeta.vanage • 880 modified 3.9 years ago by gravatar for pedsangini276 pedsangini276 • 4.8k

Subject: Applied Physics 2

Topic: Interference And Diffraction Of Light

Difficulty: Low
engineering physics
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written 7.8 years ago by gravatar for neeta.vanage neeta.vanage • 880

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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