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Lecture 22 - Recap of last lecture Bright rings when net...

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Recap of last lecture Bright rings when net phase shift = 2t+ λ /2 =m λ or 2t = (m+ ½) λ and dark rings when 2t = m λ m=0,1,2,… Thin film coatings can make perfect reflectors or perfect absorbers Diffraction
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Fraunhofer Diffraction P will be a dark band if ½asin θ = ½ λ Or sin θ = m λ /a m =±1, ±2, … If x >> a then sin θ ~ θ ~ tan θ therefore minima is at θ = λ /a or y = x λ /a All minima at y = xm λ /a with m =±1, ±2, …
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