Chapter 35a - Chapter 35: Interference ! ! ! ! ! ! Teaching...

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Ch. 35: Interference - Part A 1 November 30, 2009 1 Chapter 35: Interference ! Teaching evaluations. ! Light as a wave. Huygens’ principle. ! Wavelength and index of refraction. ! Demonstration of diffraction - Wednesday. ! Young’s interference experiment. ! HITT free question.
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Ch. 35: Interference - Part A 2 November 30, 2009 2 The Nature of Light ! Light is complicated. Understanding the nature of light is one of the major goals of physics, which has not been fully achieved. ! Light phenomena, e.g. wave interference or optical interference are used for coloring in nature and man-made applications. Light interference, reflection, refraction and color shifting.
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Ch. 35: Interference - Part A 3 November 30, 2009 3 Light as a Wave: Hyugens’ Principle ! The first useful wave theory for light, 1678, Christian Hyugens (Dutch physicist). 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. ! Based on a geometrical construction, predicts the position of a given wavefront. ! 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.
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Ch. 35: Interference - Part A 4 November 30, 2009 4 The Law of Refraction ! The refraction of a plane wave at an air- glass interface, using Huygens’ principle. ! The wavefronts in the incident light are separated by λ 1 , the wavelength in air. ! The wavefronts in the refracted light are separated by λ 2 , the wavelength in glass.
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This note was uploaded on 03/12/2010 for the course PHY PHY taught by Professor Mueller during the Spring '09 term at University of Florida.

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Chapter 35a - Chapter 35: Interference ! ! ! ! ! ! Teaching...

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