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//Chapter-2,Example 2_5,Page 2-31
clc()
//Given Data:
m=1 //order
lam=6.56*10^-7 //Wavelength of red light
theta=18.25*%pi/180 //angle of diffraction
W=2*10^-2 //width of grating
//Calculations:
//We know, (a+b)*sin(theta)=m*lam
N=sin(theta)/(m*lam) //N-number of lines per m, N=1/(a+b)
Tn=N*W //Total number of lines on grating
printf('Total number of lines on grating is = %.0f ',Tn)
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