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//Example number 4.5, Page number 67
clc;clear;
close;
//Variable declaration
a=3; //lattice spacing(m)
n=1; //order
lamda=0.82*10**-9; //wavelength(m)
theta=75.86; //angle(degree)
//Calculation
theta=theta*%pi/180; //angle(radian)
d=n*10**10*lamda/(2*sin(theta)); //spacing(angstrom)
//Result
printf("spacing is %.2f Angstrom",d)
//answer in the book is wrong. hence the miller indices given in the book are also wrong.
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