ch25notes - Diffraction effects are pronounced whenever a...

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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 wave bending around corners, through holes, etc.
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Unformatted text preview: Diffraction effects are pronounced whenever a (width of aperture) Question : why can you hear around a corner but not see around a corner?? Single-Slit Diffraction central max. a sin = , 2 , 3 , dark fringes only Gratings color separators 0) Reflection demo : CD 0) Refraction demo : laser amazer goggles Refraction grating condition d sin = 0, , 2 , 3 , maxima only Gratings are rated by their # of slits per cm, N . Suppose you have 5000 slits/cm, then d = 1/ N = 210 4 cm = 2 m....
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ch25notes - Diffraction effects are pronounced whenever a...

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