initial commit / add all books

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+// Exa 1.21.1

+clc;

+clear;

+close;

+// Given data

+d = 2.82;// in Å

+d = d * 10^-10;// in m

+n = 1;

+theta = 10;// in degree 

+//Formula 2*d*sin(theta) = n*lembda;

+lembda = 2*d*sind(theta);// in m

+lembda = lembda * 10^10;// in Å

+disp(lembda,"The wavelength of X-ray in Å is ");