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+//example-5.2
+//page no-141
+//given
+//bragg's angle of reflection
+theta1=17.03*(%pi)/180  //radians
+//wavelength of light
+lambda=0.71  //A
+//according to bragg's equation 
+//n*lambda=2*d*sin(theta)
+//for n=1
+d=lambda/2/sin(theta1)  //A
+//given that h^2+k^2+l^2=8
+//let (h^2+k^2+l^2)^1/2=H
+//we get
+H=sqrt(8)
+a=d*H  //A
+//since h^2+k^2+l^2=8 ,hence the reflecting planes will be (220). family of planes (220) include (220), (202), (022) ,etc.