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Obtain an expression for fringe width in the interference pattern of wedge shape film. How this phenomenon is used to determine thickness of thin paper.
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: Medium
engineering physics
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written 7.8 years ago by gravatar for neeta.vanage neeta.vanage • 880 modified 7.7 years ago by gravatar for yashbeer yashbeer ★ 11k

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Consider a point A very near to edge of the wedge such that thickness of the film at A is $t_1$. If $t_1$ is of such thickness that 2μ$t_1$cos(r+ѳ) is odd multiple of λ/2 then A will look bright. All along the straight line passing through AA’ has same thickness. …

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