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+//Example 5
+//chapter 45
+//clc()
+a_o=5.63//A
+d=a_o/sqrt(5)
+lambda=1.10//in A
+disp(d,"Interplanar spacing d in A=")
+
+disp("diffracted beam occurs when m=1,m=2 and m=3")
+disp("when m1=1, theta in degree=")
+m1=1
+x=(m1*lambda)/(2*d)
+theta_1=asind(x)
+disp(theta_1)
+disp("when m1=2, theta in degree=")
+m2=2
+x=(m2*lambda)/(2*d)
+theta_2=asind(x)
+disp(theta_2)
+disp("when m1=3, theta in degree=")
+m3=3
+x=(m3*lambda)/(2*d)
+theta_3=asind(x)
+disp(theta_3)
+\ No newline at end of file