Question

If μ is the refractive index, t is the thickness of the film, r is the angle of refraction, λ is the wavelength, what is the condition for dark band due to reflected light in thin films?
2 points
μt cos r = mλ
2μt cos r = (2m + 1)λ/2
2μt cos r = mλ
t cos r = (m + ½)λ
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Answer 1

Answer:

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