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In the Newtons ring experiment, determine the diameter of the $20^{th}$ ring if the diameters of the $4^{th}$& $12^{th}$ rings are 0.4 & 0.7 cm respectively.
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

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

$ D_{(n+p)}^2 - D_n^2 = \frac{4pλR}{μ} $

For air film, μ = 1

For 12$^{th}$ and 4$^{th}$ dark rings:

$ D_{12}^2 - D_4^2 = 4 \times 8 \times λ \times R $ ………………………………..(1)

For 20$^{th}$ and 4$^{th}$ dark rings:

$ D_{20}^2 - D_4^2 = 4 \times 16 \times λ \times …

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