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Unformatted text preview: Intensity in Double-Slit Interference ( 29 r k t E E - = For plane wave: sin d R For : kr r k < < 1 ( 29 ( 29 ( 29 ( 29 +- =- = 1 2 1 1 sin sin kr t E t E kr t E t E sin 2 sin sin sin 1 1 2 1 2 d kd kr kd kr kr d r r = = + = + = + = ( 29 ( 29 ( 29 ( 29 ( 29 2 / sin 2 / cos 2 1 2 1 +- = + = kr t E t E t E t E ( 29 ( 29 2 / cos 4 ~ 2 2 I I E I = + - = + 2 sin 2 cos 2 sin sin b a b a b a r E 1 ~ The waves spread out from the opening! 5. Diffraction 1) What it is? The bending of waves behind obstacles or apertures into the shadow region, that can be considered as interference of many waves. 2) Haw to observe? Diffraction is most pronounced when the wavelength of the wave is similar to the size of the obstacle or aperture. For example, the diffraction of sound waves is commonly observed because the wavelength of sound is similar to the size of doors, etc. Light will diffract around a single slit or obstacle. The resulting pattern of light and dark stripes on a screen is called a diffraction pattern (fringes)....
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This note was uploaded on 02/11/2012 for the course PHYSICS 222 taught by Professor Ogilvie during the Fall '05 term at Iowa State.
- Fall '05