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PHYSICS 002C Lecture 11

PHYSICS 002C Lecture 11 - PHYSICS 002C Lecture 11 2 DEMO...

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PHYSICS 002C Lecture 11 April 22, 2009 DEMO and Q: Polarization and Malus’s law θ 2 0 cos I I = . Two Polaroid sheets rotated from the maximum transmission configuration by an angle of 60 o transmit what fraction of incident light intensity? a) 1 m; b) 10 m; c) 100 m; d) 1 km; e) 1 mm. New material - Chap 24.9 Stimulated emission Lasers are used for manipulating cells, for measuring biological forces, for fluorescence microscopy, for cutting and suturing, for seeing inside the body, for measuring velocities of particles in the blood, …. Stimulated emission, identical photons, and time reversal invariance. Serway and Jewett Chapter 25 – Reflection and refraction New Material - Chap 25.1 The nature of light Newton’s corpuscular theory of light (ca. 1700) – Light travels in rays (straight line paths) like a stream of massless particles. Huygens wave model or Huygens’ principle (1678) – Light is a wave; each wave crest is a source of more waves, such that each point on a wave crest generates a spherical wave. The new waves add to explain reflection and refraction. Young’s interference experiments (1801) proved that light behaves like a wave, as did Maxwell’s theory (1865) and Hertz’s wave experiments (1887). BUT….
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