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diff --git a/1694/CH1/EX1.27/EX1_27.sce b/1694/CH1/EX1.27/EX1_27.sce
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+clear;
+clc;
+printf("\nEx1.27\n");
+//page no.-36
+//given
+n=1;.....................//order
+lambda=0.82*10^-10;......//wavelength in m
+a=3*10^-10;.............//lattice constant
+theta=75.86;............//angle in degrees
+//from bragg's law
+
+d=(n*lambda)/(2*sind(theta))........//interplanar spacing in m
+
+//by formula, sqrt(h^2+k^2+l^2)=a/d...miller indices can be found
+
+printf("\nmiller indices are (001),(010),(100)\n");