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White light falls normally on a soap film of thickness $5 \times 10^{-5}$ cm & of RI 1.33. Which wavelength in the visible region will be reflected most strongly?
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 7.8 years ago by gravatar for mananbothra mananbothra • 100

For constructive interference in reflected light 2μ t cos r = (2n +1) $\frac{λ}{2}$

The visible range is from 4000- 7000 AU Substitute values of n as 0,1,2,3,4……… we will get corresponding wavelengths. Those wavelengths which fall in the visible spectra will be reflected strongly.

For normal incidence cos r …

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