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# Lec22 - ture 22-1 ture Maxwells Rainbow Light is an...

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cture 22- cture 22-1 Maxwell’s Rainbow Light is an Electromagnetic Wave

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cture 22- cture 22-2 The Speed of Light Classic experiments to measure the speed of light: Galileo ( lantern and shutter ) Römer ( eclipses of Io behind Jupiter ) Fizeau ( toothed wheel ) Foucault ( plane rotating mirror ) Michelson ( octagonal rotating mirror ) Michelson and Morley ( interferometer ) 299,792,458 / c m s Speed of light is not infinite! Speed of light is not dependent on the motion of source/observer ( no fixed “ ether ”)
cture 22- cture 22-3 ©2008 by W.H. Freeman and Company

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cture 22- cture 22-4 Refraction and Transmission incident ray reflected ray refracted ray Medium 1 Medium 2 When light encounters an interface between different media, it can generally both reflect and refract . (This speed can even depend on wavelength.) Light can travel through matter medium as well as free space (vacuum). Inside matter, the speed of light v is generally less than c . ( 29 , 1 c v c n v < index of refraction
cture 22- cture 22-5 Determine the speed of light c using static measurements __1____ = 2.99792458 m/s √ ( ε o μ o ) ε o = 8.8541 x 10 -12 C 2 /(N.m 2 ) μ o = 4π x 10 -7 N/A 2 Coulomb’s law Ampere’s law

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cture 22- cture 22-6 ©2008 by W.H. Freeman and Company
cture 22- cture 22-7 PHYSICS 241 READING QUIZ 1 Which of the following statements is incorrect?

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Lec22 - ture 22-1 ture Maxwells Rainbow Light is an...

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