Physics1C_Chapter33

# Physics1C_Chapter33 - CHAPTER 33 THE NATURE AND PROPAGATION...

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CHAPTER 33 THE NATURE AND PROPAGATION OF LIGHT Vahé Peroomian

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WAVE-PARTICLE DUALITY Propagation of light described by waves: interference, diffraction, etc. Emission and absorption requires particle approach: photoelectric effect.
WAVES, WAVEFRONTS, AND RAYS Spherical EM waves propagate outward from a point source just as sound waves do in still air. Rays show the direction of propagation of the wave.

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REFLECTION AND REFRACTION A plane wave is part reflected and part refracted at the boundary between two media (e.g. air and glass)
REFLECTION Specular reflection is reflection at a definite angle from a smooth surface. Diffuse reflection is scattered reflection from a rough surface.

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LAW(S) OF REFLECTION Incident, reflected rays, refracted rays, and the normal to the surface all in the same plane. Angle of reflection ( θ r ) is equal to angle of incidence ( θ a ): θ r = θ a
EXAMPLE 1 Two mirrors make an angle of 120° with each other as illustrated in the figure. A ray is incident on mirror M 1 at an angle of 65° to the normal. Find the direction of the ray after it is reflected from mirror M 2 .

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INDEX OF REFRACTION Index of refraction is dimensionless, and is ≤ 1. n º speed of light in vacuum avg. speed of light in medium = c v

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Frequency of the ray does not change, but wavelength changes: λ a n a = λ b n b Snell’s law of refraction can be expressed as n a sin θ a = n b sin b REFRACTION OF LIGHT
COMPUTING THE INDEX OF REFRACTION 1. Measure θ 1 and 2 2. Since n air = 1, write Snell’s Law as n 2 = sin q 1 sin q 2

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## This note was uploaded on 06/03/2011 for the course PHYSICS 1c taught by Professor Peroomian during the Spring '10 term at UCLA.

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Physics1C_Chapter33 - CHAPTER 33 THE NATURE AND PROPAGATION...

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