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228s12-l06

228s12-l06 - Physics 228 Today Diffraction diffraction...

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Unformatted text preview: Physics 228 Today: Diffraction, diffraction grating Website: Sakai 01:750:228 or www.physics.rutgers.edu/ugrad/228 Diffraction is a further expansion of the idea of interference. We expand from two sources to a large number of sources. Here is an example from around home: CDs have grooves every ≈ 1.6 μ m, or about 25000 grooves around the disk, acting as sources for an interference pattern. Monday, February 6, 2012 Are Shadows Infnitely Sharp? IClicker 1 oF 4 Can shadows be infnitely sharp? a) Always! b) Yes - For a point source and sharp edge! c) Yes - For an edge, but not For a slit. d) Never - the world just doesn’t work that way. e) No - aren’t we studying diFFraction today? Monday, February 6, 2012 Are Shadows Infnitely Sharp? No. Many examples: PhET demo, real physical in-class demo With a thin slit, you can see the light expand to both sides and form light and dark bands. Monday, February 6, 2012 Why Does Light “Expand” Past the Edges You Expect from Geometrical Optics? Huygen’s Principle Introduced back in chapter 33, but we did not cover it then. Each point on the wave front can be viewed as a source for spherical waves propagating out from that point. The wave front is the envelope of all the secondary waves. The sum of all these wavefronts will bend around corners, as compared to straight geometrical optics. Monday, February 6, 2012 Why Does Light “Expand” Past the Edges You Expect from Geometrical Optics?...
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228s12-l06 - Physics 228 Today Diffraction diffraction...

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