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+//Example 14.4 // wavelength & angle
+clc;
+clear;
+//given data :
+d=2.82;//spacing between successive planes in A
+theta=8+35/60;//in degree
+theta=theta*%pi/180;// to convert in radian
+n=1;// order of reflection
+lamda=2*d*sin(theta) /n;//de-broglie equation
+disp(lamda,"wavelength of NaCl in A ")
+n=2;//to find angleof reflection
+theta=asin(n*lamda/(2*d));//angle of reflection radian
+theta=theta*180/%pi;// to convert in degree
+disp(theta,"angle of reflection in degree")