lecture27 - Physics 2102 Jonathan Dowling Lecture 27...

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Lecture 27 Lecture 27 Physics 2102 Jonathan Dowling Ch. 35: Interference Ch. 35: Interference Christian Huygens 1629-1695
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Wave Optics: Huygen’s Principle Wave Optics: Huygen’s Principle Christian Huygens 1629-1695 All points in a wavefront serve as point sources of spherical secondary waves. After a time t, the new wavefront will be the tangent to all the resulting spherical waves.
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Reflection and Refraction Reflection and Refraction Laws from Huygen’s Laws from Huygen’s hc hc 2 2 sin , sin λ θ = = 1 1 2 1 2 2 sin sin v v = = 1 1 1 2 2 sin sin n n = 1 The light travels more slowly in more dense media: v=c/n ( n =index of refraction) Snell’s law! 2 1 2 v v = 1 n c v n n = = f c n n c v f n n n = = = = / / Wavelength: Frequency:
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Young’s Double Slit Experiment: Lasers are a recent (1960’s) invention. Before that it was challenging to demonstrate that light was indeed a wave. Young created a clever simple
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lecture27 - Physics 2102 Jonathan Dowling Lecture 27...

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