chapter22.1-22.3 - Reflection and Refraction of Light And...

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3/1/2009 1 Reflection and Refraction of Light And God said, Let there be light : and there was light. 1000 AD: Light was believed to be tiny particles Newton: Explained reflection and refraction using particle model Huygens: Light is wave-like Young (Double slit experiment): Support of wave theory by showing i nterference Maxwell: Light is electromagnetic wave Einstein: Light has quantized energy (concept of photon ) Today: Dual nature of light; light is both particle and wave
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3/1/2009 2 Wave nature: EM wave; all properties of propagating “wave” “Particles” of light are called photons; e ach photon has a particular energy Both natures of light: Interacts like a particle; has a certain frequency ( f ), wave! Experiments can be devised to display either the wave or the particle nature of light In some experiments light acts as a wave and in others it acts as a particle constant) s Planck' : s J 10 63 . 6 ( 34 h hf E The ray approximation is used to represent beams of light Light travels in a straight-line path in a homogeneous medium until it encounters a boundary between two different media Transparent materials: Light can propagate without significant attenuation Opaque materials: Light cannot propagate through
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