PHY213_Chapter24_Sec6to9

# PHY213_Chapter24_Sec6to9 - Chapter 24 Wave Optics General...

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Unformatted text preview: Chapter 24 Wave Optics General Physics Diffraction and Polarization Sections 6 – 9 General Physics Huygen’s Principle Christian Huygens (1629 – 1695) assumed that light is a form of wave motion rather than a stream of particles Huygens’ Principle is a geometric construction for determining the position of a new wave at some point based on the knowledge of the wave front that preceded it All points on a given wave front are taken as point sources for the production of spherical secondary waves, called wavelets, which propagate in the forward direction with speeds characteristic of waves in that medium After some time has elapsed, the new position of the wave front is the surface tangent to the wavelets General Physics Huygens’ Construction for a Plane Wave At t = 0, the wave front is indicated by the plane AA’ The points are representative sources for the wavelets After the wavelets have moved a distance cΔt, a new plane BB’ can be drawn tangent to the wavefronts General Physics Huygens’ Construction for a Spherical Wave The inner arc represents part of the spherical wave The points are representative points where wavelets are propagated The new wavefront is tangent at each point to the wavelet General Physics Diffraction Huygens’ principle requires that the waves spread out after they pass through narrow slits This spreading out of light from its initial line of travel is called diffraction In general, diffraction occurs when waves pass through small openings, around obstacles or by sharp edges General Physics Single-Slit Diffraction A single slit placed between a distant light source and a screen produces a diffraction pattern It will have a broad, intense central band – central maximum The central band will be flanked by a series of narrower, less intense secondary bands – secondary maxima The central band will also be flanked by a series of dark bands – minima The results of the single slit cannot...
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PHY213_Chapter24_Sec6to9 - Chapter 24 Wave Optics General...

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