110316-opp - 3/16/11 Physics 122 1 5.1 5.2 5.3 5.4 a 2% 16%...

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Unformatted text preview: 3/16/11 Physics 122 1 5.1 5.2 5.3 5.4 a 2% 16% 31% 43% b 73% 11% 6% 8% c 19% 66% 14% 4% d 5% 2% 6% 17% e 0% 6% 42% 29% http://www.physics.uoguelph.ca/ applets/Intro_physics/kisalev/java/ clens/index.html 3/16/11 Physics 122 3 3/16/11 Physics 122 5 3/16/11 Physics 122 6 Interference Diffraction 3/16/11 Physics 122 7 Interference Use Huygens’ Model 3/16/11 Physics 122 8 3/16/11 Physics 122 9 Slits are really much, much closer than shown so this point is almost all the way to the left. y L D sin = a y tan = L a D 3/16/11 For small angles, sin ~ tan ~ Physics 122 Maximum when D=n Minimum when D = (n + 1 2 ) Dy = a L 10 3/16/11 Physics 122 11 3/16/11 Physics 122 12 When the distance traveled by the wavelet from the middle of the slit is half a wavelength greater than the distance traveled by the wavelet from the top of the slit every wavelet from the top half of the slit has a canceling wavelet from the bottom half of the slit. d d/2 D 3/16/11 Physics 122 The result is no intensity at that angle. 13 0.3 0.25 0.2 0.15 0.1 0.05 0 -20 -15 -10 -5 0 5 10 15 20 -0.05 x D=0 D = /2 D= d/2 D 3/16/11 Physics 122 14 3/16/11 Physics 122 15 d sin 2 DMin 1 3/16/11 DMin 1 = a sin 2 IMin 1 d Physics 122 IMin 1 = 2 2a 16 3/16/11 Physics 122 17 ...
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