lecture 2 100826 - A Brief History of Light 1000 AD It was...

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A Brief History of Light s 1000 AD s It was proposed that light consisted of tiny particles s Huygens-1678 s Explained many properties of light by proposing light was wave-like s Newton-1752 s Used this particle model to explain reflection and refraction s Young-1801 s Strong support for wave theory by showing interference s Maxwell-1865 s Electromagnetic waves travel at the speed of light Well- not-so-brief History of Light 20 th Century s Planck s EM radiation is quantized s Implies particles s Explained light spectrum emitted by hot objects s Einstein s Particle nature of light s Explained the photoelectric effect s Experiments can be devised that will display either the wave nature or the particle nature of light s In some experiments light acts as a wave and in others it acts as a particle s Nature prevents testing both qualities at the same time What does light do? Travel in a straight line Except when it passes from one substance to another Light rays and angles are in one plane
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lecture 2 100826 - A Brief History of Light 1000 AD It was...

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