lecture35 - Diffraction (38.1 38.4) Interference effects...

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Interference effects for continuous sources: i) Light bends around corners. ii) “Shadows” fill in iii) “Parallel” beams always spread iv) Resolution of microscopes and telescopes limited Diffraction Diffraction (38.1 – 38.4) Practice: Chapter 38, problems 3, 7, 13, 25, 28 Fraunhofer Diffraction : (easy math) Source, screen “ at eg. Fresnel Diffraction : (complicated math) Source distance, object size, screen distance all comparable. eg. Source Steel Ball Screen Shadow Poisson Spot
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Huygens’s Principle Principle (Christiaan Huygens, (Christiaan Huygens, ~ ~ 1678) 1678) e.g. , parallel beam of light: “Plane wave” wavefronts: flat planes for a parallel beam. Wave propagation can be treated as if each point on a wavefront is a source of semicircular“wavelets” spreading out in forward directions. These wavelets overlap and interfere to form the wave at later times. Flat wavefront (parallel rays) gives a new
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lecture35 - Diffraction (38.1 38.4) Interference effects...

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