SG_Chap22

# SG_Chap22 - Chapter 22 The reflection and refraction of...

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1 Chapter 22 The reflection and refraction of light 22.1 The nature of light 1000 AD light is made of tiny particles Rays of particles (Newton, 1642-1727) Rays of waves (Huygens, 1629-1695) Young’s experiment (1801) supported waves Mathematical description of waves (Maxwell, 1865), a beautiful end to the story of light. But… Planck suggested that light in quantized (particles!) E = nhf where f is the light frequency, and h the Planck constant ( h = 6.626 x 10 -34 J·s), n the number of “quanta” (photons!) He had to apologize because he didn’t understand why it worked for his calculations Einstein suggested (1905) that light is a ray of particles (photons), each having E = hf How to reconcile with Young, Huygens, Maxwell, the wave equations? Light is both particles and waves Everything is a particle and a wave (quantum physics) Dual nature of matter 22.2 Reflection and refraction of light Absorption Reflection (bounces) Mirrors Refraction (bends) Lenses Often some of each Specular and diffuse reflection

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