110311-opp - 3/11/11 Physics 122 1 3/11/11 Physics 122 2...

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Unformatted text preview: 3/11/11 Physics 122 1 3/11/11 Physics 122 2 3/11/11 Physics 122 4 3/11/11 Physics 122 5 3/11/11 Physics 122 6 3/11/11 Physics 122 7 Ripple tank analogy Can two sources lead to both “bright spots” and “dark spots”? 3/11/11 Physics 122 8 3/11/11 Physics 122 9 Ripple tank analogy 3/11/11 Physics 122 10 3/11/11 Physics 122 11 3/11/11 Physics 122 12 The wavelet model implies that a plane wave will travel in a straight line. 3/11/11 Physics 122 13 http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=16 3/11/11 Physics 122 14 2. by the time the trailing (right) edge of the incoming wave hits the wavelet has grown this much i f 3. the trailing edge hits starting a wavelet and defining a wave front 1. leading (left) edge of incoming wave (red) hits and starts outgoing wavelet (blue circle) 4. Since the red and blue triangles are similar, The wavelet model implies that a plane wave will reflect off a mirror according to the rule: 3/11/11 P = angle angle of incidence hysics 122 of reflection. i = 15 f 3/11/11 Physics 122 16 1. leading (left) edge of incoming wave hits and starts outgoing wavelet (blue circle) 3. the trailing edge hits starting a wavelet and defining a blue wave front i ct Speed here = c 4. Since v t < c t, the triangles are NOT similar, and i > r r Speed here = v 2. by the time the trailing (right) edge of the incoming wave hits the wavelet has grown this much (v t) 3/11/11 Physics 122 17 i ct i vt r ct sin i = h vt sin r = h 1 1 sin r = sin v c r The wavelet model implies that a plane wave will refract into a medium according to the Snell’s law and tells us that n = c/(speed of light in the medium). http://www.walter-fendt.de/ph11e/huygenspr.htm 3/11/11 Physics 122 18 http://www.phy.ntnu.edu.tw/java/propagation/propagation.html i 3/11/11 Physics 122 19 ...
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This note was uploaded on 12/28/2011 for the course PHYSICS 122 taught by Professor Bhagat during the Fall '11 term at Maryland.

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