2010 PHYSICS 002C Lecture 16

2010 PHYSICS 002C Lecture 16 - PHYSICS 002C Lecture 16 May...

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Lecture 16 May 5, 2010 Serway and Jewett Chapter 27.4-6 – Wave optics Clicker Q1: Soap bubbles exhibit colors because of interference of light that is a) diffracted b) inflected c) deflected d) reflected e) refracted from the two sides of the film. Clicker Q2: The intensity due to the electric field amplitudes of two interfering light waves is obtained from a) the square of the sum of the two intensities; b) the square of the sum of the two amplitudes; c) the sum of the squares of the two amplitudes; d) the square root of the sum of the squares of the two intensities; e) the square of the square of the two amplitudes. J. C. Maxwell 1864 theory of light Clicker Q3: The divergence of a light beam of limited lateral extent is called a) deflection; b) infraction; c) diffraction; d) refraction; e) reflection. Summary of previous lecture : Given that : Light is a wave of the electromagnetic field that obeys the superposition principle because it is governed by a linear wave equation . Wave interference becomes totally spooky and inexplicable (in the sense that they are what they are, no more, no less) examples of wave-particle duality when we find out that they work for single particles of light (photons) when the intensity is turned way down. Wave optics is a straight forward application of Maxwell’s equations that we study wave optics to understand optical instruments and to be ready to appreciate the quantum world . Roy J. Glauber Nobel Prize 2005 for 1963 theory of coherent light Chap 27.1 – Conditions for interference Light beams interfere constructively or destructively when they overlap in time and space and their separate electric fields combine. Low intensity light waves pass through each other even though their electric fields are combined 2 1 E E at the intersection because the wave equation is linear . Two light beams for which interference effects can be observed are said to be coherent . Otherwise the light is said to be incoherent . A. A. Michelson Nobel Prize 1907 for 1887 experiment disproving the Aether theory The coherence length L of the light source is the propagation distance over which the phase difference becomes random / c L . Interference effects with a laser illuminating a Michelson interferometer
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This note was uploaded on 09/23/2010 for the course PH 02c taught by Professor Mile during the Spring '04 term at Riverside Community College.

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2010 PHYSICS 002C Lecture 16 - PHYSICS 002C Lecture 16 May...

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