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//Chapter-2,Example2_6_5,pg 2-34
wavelength=5890*10^-10 //wavelength of light
d_wavelength=6*10^-10
m=2 //for second order
N=wavelength/(d_wavelength*m)
W=3 //width of grating
width=W/N
printf('\nNumber of lines is N = %.0f \n',N)
printf('\n The grating element(width of line) is a+b =%.7f cm',width)
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