lecture18

Fundamentals of Physics, (Chapters 21- 44) (Volume 2)

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Unformatted text preview: Chapter 35: Interference Tuesday, August 7, 2007 More About Light & Waves I Light as a wave : As we learned before, light is an electromagnetic wave; at each point ~ E will produce ~ B and ~ B will produce ~ E . I Huygens’ Principle : All points on a wavefront serve as a point source of spherical secondary wavelets. After a time t , the new position of the wave front will be that of a surface tangent to these secondary wavelets. Loading huygen1.mpg Loading huygen2.mpg The Law of Refraction Main idea: each point is considered a source. In the interface between two materials (e.g. air and glass), we have: sin θ 1 = λ 1 λ 2 = v 1 v 2 = n 2 n 1 If n 1 = 1 in air, v 1 = c : n = c v Loading refraction3.mpg The Law of Refraction Main idea: each point is considered a source. In the interface between two materials (e.g. air and glass), we have: sin θ 1 = λ 1 λ 2 = v 1 v 2 = n 2 n 1 If n 1 = 1 in air, v 1 = c : n = c v Loading refraction5.mpg The Law of Refraction Main idea: each point is considered a source. In the interface between two materials (e.g. air and glass), we have: sin θ 1 = λ 1 λ 2 = v 1 v 2 = n 2 n 1 If n 1 = 1 in air, v 1 = c : n = c v Loading refraction6.mpg The Law of Refraction Main idea: each point is considered a source.Main idea: each point is considered a source....
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lecture18 - Chapter 35: Interference Tuesday, August 7,...

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