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Chapter 35b

# Chapter 35b - Chapter 35 Interference Light as a wave HITT...

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Ch. 35: Interference - Part B 1 December 2, 2009 Chapter 35: Interference ! Light as a wave. ! HITT question #1. ! HITT question #2. ! Reflection phase shifts. ! Interference in thin films – demonstration and quantitative treatment. ! Diffraction – starting on Friday, to be continued next week in Ch. 36. ! Exam 3 sheets will be returned on Friday.

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Ch. 35: Interference - Part B 2 December 2, 2009 Light as a Wave: Hyugens’ Principle ! The first useful wave theory for light, 1678, Christian Hyugens. plane wave ! Mathematically simple, gives physical meaning to the index of refraction and explains the laws of reflection and refraction. ! Less comprehensive than Maxwell’s electromagnetic theory. ! Huygens’ principle: all points on a wavefront serve as point sources of spherical secondary wavelets. After a time t , the new position of the wavefront will be that of a surface tangent to these secondary wavelets.
Ch. 35: Interference - Part B 3 December 2, 2009 The Index of Refraction ! The index of refraction n for any medium is defined as the ratio of the speed of light in vacuum and the speed of light in the medium. ν = c n (index of refraction) λ λ = n n ν λ λ = = = n n c f f ! The speed, wavelength and frequency of light in a medium with refraction index n are: ν = c n (wavelength) (speed) (frequency)

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Ch. 35: Interference - Part B 4 December 2, 2009 HITT Question ! Three pulses of light – 1, 2, and 3 – of the same wavelength are sent through layers of plastic having the indexes of refraction – 1.60, 1.50, and 1.55, respectively, and along the paths as shown. Rank the pulses according to their travel time through the plastic layers, greatest first.
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