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PHYSICS 002C Lecture 12

# PHYSICS 002C Lecture 12 - PHYSICS 002C Lecture 12 Serway...

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PHYSICS 002C Lecture 12 April 24, 2009 Serway and Jewett Chapter 25 – Reflection and refraction Chap 25.1 The nature of light Newton’s corpuscular theory of light (ca. 1700) Huygens wave model or Huygens’ principle (1678) Hertz’s wave experiments (1887) Hertz’s photoelectric effect experiments (1887) Which one – wave or particle – depends on the experiment. Wave-particle duality is universal. Chap 25.2 There is no such thing as a perfect light ray. But … a point on a wave moves perpendicular to the wave front along a path that is an ideal light ray. Chap 25.3 Reflection of light The law of reflection is ' 1 1  This law does not hold for a rough surface because such a surface does not have translational and rotational symmetry. Chap 24.4 Refraction of light is the bending of a light ray as it moves through regions of space where its speed is changing with position. Since the wavelength is / 2 / v f v , as the velocity in a material, , becomes less than c , the wavelength gets shorter. v Here, light of wavelength 1 in air is entering glass where its wavelength is 2 . Continuity of the wave crests across the boundary surface require that 1 1 sin d and 2 2 sin d . Eliminating d we have Snell’s law – 2 2 1 1 sin sin n n . The index of refraction is defined as 1 n / / / vac f c v c n . Q: Raindrop prelude – The figure shows a light ray bending when

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PHYSICS 002C Lecture 12 - PHYSICS 002C Lecture 12 Serway...

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