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+//chapter9,Example9_6,pg 239
+
+a=3.615*10^-10
+
+d111=a/sqrt(1+1+1)//for 111 plane
+
+theta=21.7*(%pi/180)//converting into radian
+
+lam=2*d111*sin(theta)
+
+printf("wavelength of X-rays\n")
+
+disp(lam) \ No newline at end of file