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# ch25notes - Chapter 25 Notes Physical Optics theory of how...

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Chapter 25 Notes College Physics by Giambattista et al. John B. Ross, Ph.D. IUPUI Physics Dept. Physical Optics theory of how light moves as a wave Interference – how waves overlap (general phenomenon) CONSTRUCTIVE in phase, “bright” DESTRUCTIVE completely out of phase, “dark” IN BETWEEN partially out of phase, “gray” Path difference Δ = 0, λ , 2 λ, 3 λ , … constructive = ,... 2 5 , 2 3 , 2 destructive Young’s Two-Slit Experiment y d θ D Δ Path difference d sin θ = 0, λ , 2 λ, 3 λ , … constructive = ,... 2 5 , 2 3 , 2 destructive

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Chapter 25 Notes College Physics by Giambattista et al. John B. Ross, Ph.D. IUPUI Physics Dept. Note that D y tan Diffraction
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Unformatted text preview: Diffraction effects are pronounced whenever λ ≤ a (width of aperture) Question : why can you hear around a corner but not see around a corner?? Single-Slit Diffraction θ central max. a sin θ = λ, 2 λ, 3 λ ,… dark fringes only Gratings – color separators 0) Reflection – demo : CD 0) Refraction – demo : laser amazer goggles Refraction grating condition d sin θ = 0, λ , 2 λ, 3 λ , … maxima only Gratings are rated by their # of slits per cm, N . Suppose you have 5000 slits/cm, then d = 1/ N = 2×10 –4 cm = 2 μm....
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