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//Example number 5.12, Page number 89
clc;clear;
close;
//Variable declaration
m=1.675*10**-27; //mass(kg)
h=6.626*10**-34; //plank constant
E=0.04; //kinetic energy(eV)
e=1.6*10**-19; //charge(c)
n=1;
d110=0.314*10**-9; //spacing(m)
//Calculation
E=E*e; //energy(J)
lamda=h/sqrt(2*m*E);
theta=asin(n*lamda/(2*d110)); //glancing angle(radian)
theta=theta*180/%pi; //glancing angle(degrees)
theta_m=60*(theta-int(theta));
//Result
printf("glancing angle is %d degree and %d minutes",theta,theta_m)
//answer given in the book is wrong
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