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+//Exa 1.7
+clc;
+clear;
+close;
+//given data
+
+theta=16.8/2;//in degree
+n=2;//order unitless
+d=0.4;//in nm
+lambda=(2*d*sin(theta*%pi/180))/n;//in Angstrum
+disp(lambda,"wavelength of X-rays in Angstrum : ");
+//Note: Ans in the book is not correct
+\ No newline at end of file