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Why does the fringe width decrease as order increase in Newton`s ring but remain constant in a wedge shape film. How would be the interference pattern in both the cases if illuminated by white light.
written 6.7 years ago by gravatar for neeta.vanage neeta.vanage • 860 modified 2.7 years ago by gravatar for pedsangini276 pedsangini276 • 4.8k

Subject: Applied Physics 2

Topic: Interference And Diffraction Of Light

Difficulty: Medium
engineering physics
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written 6.6 years ago by gravatar for neeta.vanage neeta.vanage • 860

One can say that rings are unequally spaced, because difference between two consecutive rings represents thickness of ring. In case of the wedge-shaped film, t remains constant along lines parallel to the thin edge of the wedge. Hence the maxima and minima are straight lines parallel to the thin edge of the wedge. If illuminated by white light, instead of dark and bright fringes, coloured fringes will be obtained.
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