2010 PHYSICS 002C Lecture 15

2010 PHYSICS 002C Lecture 15 - PHYSICS 002C Lecture 15 May...

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PHYSICS 002C Lecture 15 May 3, 2010 Serway and Jewett Chapter 27.1-3 – Wave optics Clicker Q1: Completely incoherent light beams exhibit a) maximal overlap; b) vibranitious electromagnetic waves; c) fromulated light; d) the deficiency of Maxwell’s equations; e) no interference effects. Clicker Q2: The intensity of two interfering light waves is obtained from a) the sum of the squares of the two amplitudes; b) the square root of the sum of the squares of the two intensities; c) the square of the square of the two amplitudes d) the square of the sum of the two amplitudes; e) the square of the sum of the two intensities. In this chapter we move from the ray approximation to the wave description of light. The old rays were really describing the paths taken by the wave fronts for geometries varying gradually compared to a wavelength. Prelude Given that : I. Light is a wave of the electromagnetic field predicted by Maxwell and experimentally demonstrated by Hertz; II. The superposition principle holds for any waves governed by a linear wave equation ; Then there is nothing remarkable or astonishing about the interference of light waves as exhibited in Young’s double slit Lloyd’s mirror Newton’s rings Michelson’s interferometer Rowland’s diffraction gratings Gabor’s holography Airy’s disk Poisson’s spot Fresnel’s zone plate Fabry and Pérot’s etalon Fraunhoffer’s diffraction Thomas Young’s 1803 double slit experiment 1
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According to Maxwell’s equations: The wave velocity is given by one over the square root of the product of the permittivity and permeability of empty space (a.k.a. free space or the vacuum); Except that Maxwell’s equations do not mention any reference frame. At first people called empty space the “aether” or in modern parlance the
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2010 PHYSICS 002C Lecture 15 - PHYSICS 002C Lecture 15 May...

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