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phy142kk:lectures:fr1 [2015/05/11 10:10]
kkumar [Intensity pattern for a single slit]
phy142kk:lectures:fr1 [2015/05/11 10:14] (current)
kkumar [Diffraction grating]
Line 135: Line 135:
  
 but that the larger the number of slits from which diffraction occurs the sharper the maxima will be. but that the larger the number of slits from which diffraction occurs the sharper the maxima will be.
 +
 +===== n slits =====
 +
 +{{nslitgrating.png}}
 +
 +n=2 $\frac{I_{\theta}}{I_{0}}=\frac{(2+2\cos\delta)}{4}$
 +
 +n=3 $\frac{I_{\theta}}{I_{0}}=\frac{3+4\cos\delta+2\cos 2\delta}{9}$
 +
 +n=4 $\frac{I_{\theta}}{I_{0}}=\frac{4+6\cos\delta+4\cos 2\delta+2\cos 3\delta}{16}$
 +
 +For any $n$
 +
 +$\frac{I_{\theta}}{I_{0}}=\frac{n+\sum\limits_{k=1}^{n-1}2(n-k)\cos(k\delta)}{n^{2}}$
  
 ===== Polarizers ===== ===== Polarizers =====
phy142kk/lectures/fr1.1431353420.txt ยท Last modified: 2015/05/11 10:10 by kkumar
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