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+//example-5.3
+//page n0-141
+//given
+//lattice constant
+a=1.54  //A
+//wavelength of beam of light
+lambda=1.54 //A
+//according to bragg's equation
+//n*lambda=2*d*sin(theta)
+//following angles are given
+theta1=20.3*(%pi)/180
+theta2=29.2*(%pi)/180
+theta3=36.7*(%pi)/180
+theta4=43.6*(%pi)/180
+//interplaner spadcing is 
+d1=lambda/(2*sin(theta1))  //A
+d2=lambda/(2*sin(theta2))  //A
+d3=lambda/(2*sin(theta3))  //A
+d4=lambda/(2*sin(theta4))  //A
+//magnitude of bragg's 
+//we have h^2+k^2+l^2=a^2/d^2
+//let a^2/d^2= D for notation only
+//so
+D1=2
+D2=4
+D3=6
+D4=8
+//so from bragg's magnitude we can get (hkl)
+//(hkl1)=(110)
+//(hkl3)=(200)
+//(hkl3)=(211)
+//(hkl4)=(220)
+printf ("the reflection will take from {110},{200},{211} and (220)")