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diff --git a/1026/CH9/EX9.1/Example9_1.sce b/1026/CH9/EX9.1/Example9_1.sce
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+//chapter9,Example9_1,pg 237
+
+d=4.255*10^-10
+
+lam=1.549*10^-10//wavelength of K-copper line
+
+n=1//theta is smallest when n=1
+
+theta=asin(lam/(2*d))//glancing angle
+
+theta=theta*(180/%pi)
+
+//max value of sin(theta)=1
+
+//for highest order
+
+nmax=((2*d)/lam)//highest bragg's order
+
+printf("smallest glancing angle\n")
+
+printf("theta=%.2f deg.",theta)
+
+printf("\nmaximum order of reflection\n")
+
+printf("nmax=%.2f",nmax)
+
+printf("\nsince fraction is meaningless for order nmax=5")
+\ No newline at end of file