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diff --git a/1694/CH1/EX1.26/EX1_26.sce b/1694/CH1/EX1.26/EX1_26.sce
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+clear;
+clc;
+printf("\nEx1.26\n");
+//page no.-35
+//given
+lambda=3*10^-10;.........//wavelength in m
+h=1;
+k=0;
+l=0;
+theta=40;..............//glancing angle in degrees
+n=1;....................//order
+//from bragg's law
+
+d=(n*lambda)/(2*sind(theta));........//interplanar spacing in m
+
+a=d*sqrt(h^2+k^2+l^2);..............//lattice constant in m
+
+V=a^3.......................//volume of unit cell in m
+
+printf("\nvolume of unit cell is 1.27*10^-29 m^3\n");