APHY202 3/9/2016 1 24.1 Huygens’ Principle and Diffraction   Isaac Newton – light is a stream of particles   Christian Huygens – light is a wave 

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Presentation transcript:

APHY202 3/9/ Huygens’ Principle and Diffraction   Isaac Newton – light is a stream of particles   Christian Huygens – light is a wave   Each point on the old wave front is a source for the new wave front.

APHY202 3/9/ Huygens’ Principle and Refraction   The frequency of light does not change as it travels from one medium to the next.

APHY202 3/9/ Interference   Thomas Young (1801)

APHY202 3/9/ Interference

APHY202 3/9/ Interference   Constructive: d sinθ = mλ m = 0,1,2, …   Destructive: d sinθ = (m+½)λ m = 0,1,2, …

APHY202 3/9/ Interference

APHY202 3/9/ The Visible Spectrum and Dispersion

APHY202 3/9/ The Visible Spectrum and Dispersion

APHY202 3/9/ The Visible Spectrum and Dispersion

APHY202 3/9/ The Visible Spectrum and Dispersion

APHY202 3/9/ The Visible Spectrum and Dispersion

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