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//Example number 4.1, Page number 66
clc;clear;
close;
//Variable declaration
d=0.282*10**-9; //lattice spacing(m)
theta=8+(35/60); //glancing angle(degree)
n=1; //order
Theta=90; //angle(degree)
//Calculation
theta=theta*%pi/180; //angle(radian)
Theta=Theta*%pi/180; //angle(radian)
lamda=2*d*sin(theta)/n; //wavelength(m)
nmax=2*d*sin(Theta)/lamda; //maximum order of diffraction
//Result
printf("wavelength is %.3f Angstrom",lamda*10**10)
//answer varies due to rounding off errors
printf("\n maximum order of diffraction is %d",round(nmax))
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