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Lecture16_Chapter16 - Lecture 16 Properties of Light!hapter...

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1 Lecture 16: Properties of Light !hapter 16 Plan 1. Interference and Diffraction of Waves - Interference colors by reflection from thin films 2. Light Polarization 3. Wave Wave BParticle Duality. Photoelectric effect. Particle Duality. Photoelectric effect. !hapter 16: Homework 3 4ey Terms 3 8eview ;uestions: 1, 2, 4, 5, A, 1B, 12 3 Cxercises: 1, 2, 1B, 11, 16, 1A, 2B 1. Diffraction The property of light to bend as it passes around an obstacle or narrow slit, causing the light to spread and to produce light and dark fringes is call diffraction. Diffraction is more pronounced through relatively small openings when the light wavelength is comparable with the size of a slit or an object .
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2 Example: Diffraction of radio waves . Why the reception of AK radio waves is usually better than FK waves? Answer: The wavelength of AM waves ranges from 1MB to 55B meters. These waves are longer than most obNects on their path . Oecause of strong diffraction they easily bend the obstacles! The FM band range from 2.M to 3.4 meters. These waves are shorter relative to most of obNects . The effect of diffraction is small, and they donSt bend around buildings.
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